diff --git a/ManyCommandsApplication.sln b/ManyCommandsApplication.sln
index 1e98751..d265eb3 100644
--- a/ManyCommandsApplication.sln
+++ b/ManyCommandsApplication.sln
@@ -73,8 +73,6 @@ Global
 		{A8106A37-B6E0-4E69-9BCC-2196740EA4BF}.Debug R24|Any CPU.Build.0 = Debug R24|Any CPU
 		{A8106A37-B6E0-4E69-9BCC-2196740EA4BF}.Debug R25|Any CPU.ActiveCfg = Debug R25|Any CPU
 		{A8106A37-B6E0-4E69-9BCC-2196740EA4BF}.Debug R25|Any CPU.Build.0 = Debug R25|Any CPU
-		{A8106A37-B6E0-4E69-9BCC-2196740EA4BF}.Installer|Any CPU.ActiveCfg = Debug R20|Any CPU
-		{A8106A37-B6E0-4E69-9BCC-2196740EA4BF}.Installer|Any CPU.Build.0 = Debug R20|Any CPU
 		{A8106A37-B6E0-4E69-9BCC-2196740EA4BF}.Release R21|Any CPU.ActiveCfg = Release R21|Any CPU
 		{A8106A37-B6E0-4E69-9BCC-2196740EA4BF}.Release R21|Any CPU.Build.0 = Release R21|Any CPU
 		{A8106A37-B6E0-4E69-9BCC-2196740EA4BF}.Release R22|Any CPU.ActiveCfg = Release R22|Any CPU
@@ -95,8 +93,6 @@ Global
 		{C0CA44C2-BBA2-4C1C-8B19-4697619BA9AA}.Debug R24|Any CPU.Build.0 = Debug R24|Any CPU
 		{C0CA44C2-BBA2-4C1C-8B19-4697619BA9AA}.Debug R25|Any CPU.ActiveCfg = Debug R25|Any CPU
 		{C0CA44C2-BBA2-4C1C-8B19-4697619BA9AA}.Debug R25|Any CPU.Build.0 = Debug R25|Any CPU
-		{C0CA44C2-BBA2-4C1C-8B19-4697619BA9AA}.Installer|Any CPU.ActiveCfg = Debug R20|Any CPU
-		{C0CA44C2-BBA2-4C1C-8B19-4697619BA9AA}.Installer|Any CPU.Build.0 = Debug R20|Any CPU
 		{C0CA44C2-BBA2-4C1C-8B19-4697619BA9AA}.Release R21|Any CPU.ActiveCfg = Release R21|Any CPU
 		{C0CA44C2-BBA2-4C1C-8B19-4697619BA9AA}.Release R21|Any CPU.Build.0 = Release R21|Any CPU
 		{C0CA44C2-BBA2-4C1C-8B19-4697619BA9AA}.Release R22|Any CPU.ActiveCfg = Release R22|Any CPU
@@ -117,8 +113,6 @@ Global
 		{4F0B5139-B810-485F-9B9F-09338A0EC1B5}.Debug R24|Any CPU.Build.0 = Debug R24|Any CPU
 		{4F0B5139-B810-485F-9B9F-09338A0EC1B5}.Debug R25|Any CPU.ActiveCfg = Debug R25|Any CPU
 		{4F0B5139-B810-485F-9B9F-09338A0EC1B5}.Debug R25|Any CPU.Build.0 = Debug R25|Any CPU
-		{4F0B5139-B810-485F-9B9F-09338A0EC1B5}.Installer|Any CPU.ActiveCfg = Debug R20|Any CPU
-		{4F0B5139-B810-485F-9B9F-09338A0EC1B5}.Installer|Any CPU.Build.0 = Debug R20|Any CPU
 		{4F0B5139-B810-485F-9B9F-09338A0EC1B5}.Release R21|Any CPU.ActiveCfg = Release R21|Any CPU
 		{4F0B5139-B810-485F-9B9F-09338A0EC1B5}.Release R21|Any CPU.Build.0 = Release R21|Any CPU
 		{4F0B5139-B810-485F-9B9F-09338A0EC1B5}.Release R22|Any CPU.ActiveCfg = Release R22|Any CPU
@@ -139,8 +133,6 @@ Global
 		{884E1358-E3E5-4264-9B80-184A1DA97F82}.Debug R24|Any CPU.Build.0 = Debug R24|Any CPU
 		{884E1358-E3E5-4264-9B80-184A1DA97F82}.Debug R25|Any CPU.ActiveCfg = Debug R25|Any CPU
 		{884E1358-E3E5-4264-9B80-184A1DA97F82}.Debug R25|Any CPU.Build.0 = Debug R25|Any CPU
-		{884E1358-E3E5-4264-9B80-184A1DA97F82}.Installer|Any CPU.ActiveCfg = Debug R20|Any CPU
-		{884E1358-E3E5-4264-9B80-184A1DA97F82}.Installer|Any CPU.Build.0 = Debug R20|Any CPU
 		{884E1358-E3E5-4264-9B80-184A1DA97F82}.Release R21|Any CPU.ActiveCfg = Release R21|Any CPU
 		{884E1358-E3E5-4264-9B80-184A1DA97F82}.Release R21|Any CPU.Build.0 = Release R21|Any CPU
 		{884E1358-E3E5-4264-9B80-184A1DA97F82}.Release R22|Any CPU.ActiveCfg = Release R22|Any CPU
@@ -161,8 +153,6 @@ Global
 		{F47F705C-483D-463F-8120-46205A4BE6D4}.Debug R24|Any CPU.Build.0 = Debug R24|Any CPU
 		{F47F705C-483D-463F-8120-46205A4BE6D4}.Debug R25|Any CPU.ActiveCfg = Debug R25|Any CPU
 		{F47F705C-483D-463F-8120-46205A4BE6D4}.Debug R25|Any CPU.Build.0 = Debug R25|Any CPU
-		{F47F705C-483D-463F-8120-46205A4BE6D4}.Installer|Any CPU.ActiveCfg = Debug R20|Any CPU
-		{F47F705C-483D-463F-8120-46205A4BE6D4}.Installer|Any CPU.Build.0 = Debug R20|Any CPU
 		{F47F705C-483D-463F-8120-46205A4BE6D4}.Release R21|Any CPU.ActiveCfg = Release R21|Any CPU
 		{F47F705C-483D-463F-8120-46205A4BE6D4}.Release R21|Any CPU.Build.0 = Release R21|Any CPU
 		{F47F705C-483D-463F-8120-46205A4BE6D4}.Release R22|Any CPU.ActiveCfg = Release R22|Any CPU
diff --git a/source/Application/Application.csproj b/source/Application/Application.csproj
index 787f7ab..3a8c7f7 100644
--- a/source/Application/Application.csproj
+++ b/source/Application/Application.csproj
@@ -6,15 +6,11 @@
         <PlatformTarget>x64</PlatformTarget>
         <ImplicitUsings>true</ImplicitUsings>
         <PublishAddinFiles>true</PublishAddinFiles>
-        <Configurations>Debug R20;Debug R21;Debug R22;Debug R23;Debug R24;Debug R25</Configurations>
-        <Configurations>Debug R20;Debug R21;Debug R22;Debug R23;Debug R24;Debug R25;Release R21;Release R22;Release R23;Release R24;Release R25</Configurations>
+        <Configurations>Debug R21;Debug R22;Debug R23;Debug R24;Debug R25</Configurations>
+        <Configurations>Debug R21;Debug R22;Debug R23;Debug R24;Debug R25;Release R21;Release R22;Release R23;Release R24;Release R25</Configurations>
         <Platforms>AnyCPU</Platforms>
     </PropertyGroup>
 
-    <PropertyGroup Condition="$(Configuration.Contains('R20'))">
-        <RevitVersion>2020</RevitVersion>
-        <TargetFramework>net48</TargetFramework>
-    </PropertyGroup>
     <PropertyGroup Condition="$(Configuration.Contains('R21'))">
         <RevitVersion>2021</RevitVersion>
         <TargetFramework>net48</TargetFramework>
diff --git a/source/CommonProject/CommonProject.csproj b/source/CommonProject/CommonProject.csproj
index 0aabf90..945f240 100644
--- a/source/CommonProject/CommonProject.csproj
+++ b/source/CommonProject/CommonProject.csproj
@@ -4,15 +4,11 @@
         <LangVersion>latest</LangVersion>
         <PlatformTarget>x64</PlatformTarget>
         <ImplicitUsings>true</ImplicitUsings>
-        <Configurations>Debug R20;Debug R21;Debug R22;Debug R23;Debug R24;Debug R25</Configurations>
-        <Configurations>Debug R20;Debug R21;Debug R22;Debug R23;Debug R24;Debug R25;Release R21;Release R22;Release R23;Release R24;Release R25</Configurations>
+        <Configurations>Debug R21;Debug R22;Debug R23;Debug R24;Debug R25</Configurations>
+        <Configurations>Debug R21;Debug R22;Debug R23;Debug R24;Debug R25;Release R21;Release R22;Release R23;Release R24;Release R25</Configurations>
         <Platforms>AnyCPU</Platforms>
     </PropertyGroup>
 
-    <PropertyGroup Condition="$(Configuration.Contains('R20'))">
-        <RevitVersion>2020</RevitVersion>
-        <TargetFramework>net48</TargetFramework>
-    </PropertyGroup>
     <PropertyGroup Condition="$(Configuration.Contains('R21'))">
         <RevitVersion>2021</RevitVersion>
         <TargetFramework>net48</TargetFramework>
diff --git a/source/ExtensibleStorageExample/ExtensibleStorageExample.csproj b/source/ExtensibleStorageExample/ExtensibleStorageExample.csproj
index a2e6c98..537edf8 100644
--- a/source/ExtensibleStorageExample/ExtensibleStorageExample.csproj
+++ b/source/ExtensibleStorageExample/ExtensibleStorageExample.csproj
@@ -5,15 +5,10 @@
         <LangVersion>latest</LangVersion>
         <PlatformTarget>x64</PlatformTarget>
         <ImplicitUsings>true</ImplicitUsings>
-        <Configurations>Debug R20;Debug R21;Debug R22;Debug R23;Debug R24;Debug R25</Configurations>
-        <Configurations>Debug R20;Debug R21;Debug R22;Debug R23;Debug R24;Debug R25;Release R21;Release R22;Release R23;Release R24;Release R25</Configurations>
+        <Configurations>Debug R21;Debug R22;Debug R23;Debug R24;Debug R25</Configurations>
+        <Configurations>Debug R21;Debug R22;Debug R23;Debug R24;Debug R25;Release R21;Release R22;Release R23;Release R24;Release R25</Configurations>
         <Platforms>AnyCPU</Platforms>
     </PropertyGroup>
-
-    <PropertyGroup Condition="$(Configuration.Contains('R20'))">
-        <RevitVersion>2020</RevitVersion>
-        <TargetFramework>net48</TargetFramework>
-    </PropertyGroup>
     <PropertyGroup Condition="$(Configuration.Contains('R21'))">
         <RevitVersion>2021</RevitVersion>
         <TargetFramework>net48</TargetFramework>
diff --git a/source/ExternalCommandOne/ExternalCommandOne.csproj b/source/ExternalCommandOne/ExternalCommandOne.csproj
index c4f3be9..a9160d6 100644
--- a/source/ExternalCommandOne/ExternalCommandOne.csproj
+++ b/source/ExternalCommandOne/ExternalCommandOne.csproj
@@ -5,15 +5,10 @@
         <LangVersion>latest</LangVersion>
         <PlatformTarget>x64</PlatformTarget>
         <ImplicitUsings>true</ImplicitUsings>
-        <Configurations>Debug R20;Debug R21;Debug R22;Debug R23;Debug R24;Debug R25</Configurations>
-        <Configurations>Debug R20;Debug R21;Debug R22;Debug R23;Debug R24;Debug R25;Release R21;Release R22;Release R23;Release R24;Release R25</Configurations>
+        <Configurations>Debug R21;Debug R22;Debug R23;Debug R24;Debug R25</Configurations>
+        <Configurations>Debug R21;Debug R22;Debug R23;Debug R24;Debug R25;Release R21;Release R22;Release R23;Release R24;Release R25</Configurations>
         <Platforms>AnyCPU</Platforms>
     </PropertyGroup>
-
-    <PropertyGroup Condition="$(Configuration.Contains('R20'))">
-        <RevitVersion>2020</RevitVersion>
-        <TargetFramework>net48</TargetFramework>
-    </PropertyGroup>
     <PropertyGroup Condition="$(Configuration.Contains('R21'))">
         <RevitVersion>2021</RevitVersion>
         <TargetFramework>net48</TargetFramework>
diff --git a/source/UpdaterExample/UpdaterExample.csproj b/source/UpdaterExample/UpdaterExample.csproj
index 01f44f6..af273ec 100644
--- a/source/UpdaterExample/UpdaterExample.csproj
+++ b/source/UpdaterExample/UpdaterExample.csproj
@@ -4,14 +4,10 @@
         <LangVersion>latest</LangVersion>
         <PlatformTarget>x64</PlatformTarget>
         <ImplicitUsings>true</ImplicitUsings>
-        <Configurations>Debug R20;Debug R21;Debug R22;Debug R23;Debug R24;Debug R25</Configurations>
-        <Configurations>$(Configurations);Release R20;Release R21;Release R22;Release R23;Release R24;Release R25</Configurations>
+        <Configurations>Debug R21;Debug R22;Debug R23;Debug R24;Debug R25</Configurations>
+        <Configurations>$(Configurations);Release R21;Release R22;Release R23;Release R24;Release R25</Configurations>
     </PropertyGroup>
 
-    <PropertyGroup Condition="$(Configuration.Contains('R20'))">
-        <RevitVersion>2020</RevitVersion>
-        <TargetFramework>net48</TargetFramework>
-    </PropertyGroup>
     <PropertyGroup Condition="$(Configuration.Contains('R21'))">
         <RevitVersion>2021</RevitVersion>
         <TargetFramework>net48</TargetFramework>