This is the third of the initial release of the PortableApps.com macOS Helper app with included PortableApps.com Platform 25.0. Can install to the local Documents directory. Also supports external drives with the PA.c Platform already installed to it as well as running from an external drive.
Download the DMG, mount it by double-clicking, copy out the PortableAppsMacHelper app, run that. You may need to right-click and open for the first run to get around macOS' gatekeeper.
On newer versions of macOS, Apple has set it so that unsigned downloaded apps can't be used and will show an error saying they are damaged or corrupt. To allow the app, after copying the PortableAppsMacHelper to your Documents folder, open a terminal window and run the following command:
sudo xattr -d com.apple.quarantine ~/Documents/PortableAppsMacHelper.app
This removes the app from the macOS quarantine and allows it to work as normal. We've applied for the Apple Developer Program and paid our $100/year fee. Once our application is complete and we've set up our signing certificate, we'll be releasing a signed version to alleviate the quarantine issue.