If you have Plugin1 CRC error when start the game follow these steps for solve this problem:
1.Open Windows Defender settings (or antivirus settings).
Go to Virus & Threat protection and click manage settings.
2.Next you need to do, find Exclusions section and click Add an exclusion.
3.Click Folder option and find Interkasa MU game client folder, select it.
Done, now you need re-install game client in same folder (as in Exclusions) and play game.
View Virustotal scan, client is clean, but some defenders have plugin issues.
For more support access discord.