um.dll is a standard DLL from the game; I don't know what kind of repack would prevent it from appearing. The original game should produce the exact same error. And what are you running as administrator?
You need to launch it through the launcher so that at least something works, and not directly through the game's EXE! It will copy the necessary files itself.
All the necessary EXE files are initially located in \FLauncher\bin\. This is done so that it can first create a backup of your original EXE files, in case you need to remove the mod. Do you think the installation wizard creates a desktop shortcut for no reason? )

I don't create repacks together with the game for a simple reason - I don't use pirated versions at all. As a programmer, I don't find this very pleasant. It's one thing when they ask for 25,000 rubles for Photoshop (or a subscription, which is even worse), and I only need it for trivial functions. There are simply no alternatives (GIMP even handles some trivial tasks rather poorly). And it's quite another thing when they ask for 300 rubles for a game.
I can't even be bothered to look for where to download it. On the other hand, I can throw in a Steam rip; it doesn't require anything and runs just like that. But I just don't understand one thing - how can you play a game on a pirated version for 10 years... Oh well, the Russian soul is greedy for freebies. Okay, I won't start a flame war; it's up to your conscience