Thank you very much, it works
Here is how I did, hoping it could help someone in the future :
Modified starting script :
created a folder called "rmod" in the same folder as where main folder is, and put the pk3 in it...veloper 1 +set fs_game "rmod" +exec myserver.cfg +map mp_harb...
had to move game.mp.i386.so in rmod folder
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Thanks again, happy to found this forum