Hi, sorry but my french is not too good. I tried to compress the liberkey with UPX took 4 hours however afterwards was not able to access any applications from the menu or from their folders outside of liberkey. I formatted and reinstalled, so is it possible to compress with UPX?

Hello and welcome on Liberkey's forums.
To aswer your question, the Liberkey project don't use any more the UPX compression.
There were too many false detections with various antivirus.
In the previous versions that used UPX compression, each software was compressed.

I suppose the compression of all the liberkey in one operation must disturb configuration files, but i'm not sure.

Sorry.

JP4U