"Repair Disk" is disabled for the boot drive. (You would have to reboot in recovery mode - cmd-R during bootup - to repair the boot partition.)
But, Repair Disk Permissions should be available. I'm guessing that you have clicked on the main disk drive icon ... and not the boot partition that is indented under it. Click on the actual partition and Repair Disk Permissions should be available.
It may be necessary to manually correct the permission on your MacintoshHD:Applications folder as well as the MacintoshHD:Applications:Graphisoft folder and all subfolders if something has gotten corrupted.
Check your Applications folder: select it in Finder and press cmd-I (File > Get Info). Go to the bottom of the panel and look at "Sharing & Permissions". Verify that system and admin have read & write access and everyone has read only. Check the Graphisoft folder and perhaps some of its subfolders. In my case (which may not be correct/normal?) - the owner is me and I, admin and everyone have read/write access.
One of the forum moderators
AC 27 USA and earlier • macOS Ventura 13.6.9, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB