You don't need to do anything as drastic as move your Cinema 4D program folder.
Cinema 4D has 2 possible locations for plugin install : In the program files 'plugins' folder & in the user's 'plugins' folder.
Just open Cinema 4D's preferences from Edit > Preferences.
In the bottom left of the window is a button that says 'Open preferences folder'. I like to create a desktop shortcut to this folder.
Move the App-link folder into the 'Plugins' folder you find here. Then you won't have problems any more.
In general, you should always try to install your plugins here not in the programs folder, unless you're specifically instructed otherwise.
I think it's a bit silly the App-link installer defaults to the plugins folder, knowing that most modern operating systems restrict permissions on this folder.
Anyway, I must say the App-link is very nice otherwise, thanks to the coder for the work they put in, & the R15 support.