1. check if there is a "MultiUniverse.dl2" inside that flmm directory located in "mods\Freelancer 2 - Crossfire\EXE" If not then the installer failed to install it (i advice to run the installer as admin) 2. if that file exists then it simply is not allowed to write to your drive D: There could be multiple reasons for such a problem. It is possible that this file already exists (that happens if previous installations existed). It also could mean that you are not allowed to write to that directo…
If you get such warnings the best would be to go the the website of your security software. Most, if not all provide a way to upload files for detailed checks. Once checked and if there is no problem with these files they will be added to the whitelist of that security software. Some of these tools even offer uploads directly.