On the latest build of V11 Build 43257 with Windows 11, I did like the new installing animation but that was short lived, I was having an issue where it wouldn't install and failed giving me the follwong message. Clicking log didn't appear to do anything.
I tracked this down to the windows defender and in the protection history I found this.
The fix was adding that path using powershell in administrator.
Press Start, type PowerShell, right-click it, and choose Run as administrator. The enter this and swap the path from the error in the protection history..
Add-MpPreference -AttackSurfaceReductionOnlyExclusions "C:\Path\To\Installer.exe"
Or exclude the entire folder
Add-MpPreference -AttackSurfaceReductionOnlyExclusions "C:\Path\To\Folder\"
Hopefully PHPRunner should now install, this worked for me.