Right-click your DayZ_BE.exe (or the launcher provided in the repack) and add the mods to the target line: -mod=@DayZ-Expansion-Core;@DayZ-Expansion;@SurvivorMissions
It is important to remember that repacks are compressed versions of the original game files. While Fitgirl is a well-known name in the compression community, downloading these files comes with risks. Ensure you have active malware protection. Right-click your DayZ_BE