I noticed that this aur package: https://aur.archlinux.org/packages/masterpdfeditor-libs-included/ Seems to have it's version rolled back and is now stuck on a version that still works with some keygen that's used to activate the program. That doesn't seem like it should be happening. (the latest version is 5.7.20 like the original package: https://aur.archlinux.org/packages/masterpdfeditor/ )
Cheers
