In this context, it is not a virus (self-replicating) nor a trojan (disguised as something else but doing harm). It simply delivers pirated content.
Smaller, optimized images load into RAM significantly faster. 78RePack.exe
78RePack.exe itself should be relatively small (usually under 5MB). If the .exe is several hundred MBs, it might be an "all-in-one" package. In this context, it is not a virus