Thanks for your answer.
I can more precisely describe the "non critical error" I get under Windows 11 when installing audiolab(v0.71) using deken from puredata 0.56.0 :
At this moment all files and subfolders are correctly installed in the externals folder.
2) However, I get a windows prompt asking me if I want to replace identical files in the destination. (I choose "replace")
3) I'm notified that access is to the target folder is denied. (I click "retry")
4) I go in a loop repeating §3 until I click "cancel"
5) I get lots of messages in the deken console, for each file : "Can't restore time : invalid arguments"
Here is a video capture : https://forum.pdpatchrepo.info/uploads/files/1766083597102-audiolab-installd...
With plugdata, the installation process breaks after failed attempt to create the first subfolder : "License". Only the files contained in the parent Audiolab folder have been copied.
Hope this helps