It’s usually recommended to completely uninstall any previous versions of Adobe software beforehand, and as a precaution you can/should also use the Creative Cloud Cleaner Tool to remove all traces that may be left behind. After that, perform a reboot and then reinstall the m0nkrus package. I haven’t installed that particular collection myself, so it’s possible it’s an error, but m0nkrus’ à la carte apps usually work without any major issues.
I’d also recommend reading this wiki for some alternative activation methods and tips in case you can’t get it working.