Apologies, I failed to do a proper search on this very thread. On the previous page (32) someone describes my exact issue.
Apparently the patch tool on Windows 11 only shows desktop, in that same post there is a handy link from another user to download the DLL directly, put that in my Rocksmith folder and everything works a treat.
I feel ashamed for missing this and happy to be able to play custom songs again. Thanks!
I'm trying to use the RS2014 mod installer but when I click the big Enable CLDC button it only shows my Desktop folder and subfolders with no apparent option to switch drives (Rocksmith is on my D drive)
Anyone got any suggestions for that?