Howto fix "This server is using modified assembly"

STEP 1
Go to your unturned folder, on my pc, its located at : C:\Program Files (x86)\Steam\steamapps\common\Unturned
STEP 2
Delete the folder called Bundles.
STEP 3
Go to the folder named Unturned_Data and delete the folder named Managed.
STEP 4
Open your steam, and go to your library and right click unturned, and select Properties.
STEP 5
Press LOCAL FILES, and click Verify integrity of game cache.
It will start checking your unturned files, then it starts to download the missing folders.
STEP 6
After they have downloaded, download the Unturned .dat verification remover.
Open the file you downloaded, and drag the file from it to the Managed folder. (C:\Program Files (x86)\Steam\steamapps\common\Unturned\Unturned_Dat a\Managed)
STEP 7
Run the file "CecilDllPatcher.exe" on your managed folder." It takes about 10-20 seconds to finish.
STEP 8
Reinstall your hacks, download "Olma's hack" or other hacks.

And BOOM!

Start unturned, and you are ready to play on multiplayer!