Download Flame MU Client – Season 21 2026
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S21 PREMIUM
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Download Flame MU game client and start playing! Current version: Season 21

Important Notice

We are currently using Season 21 Part 1–2, the newest MU version available. Since this version is still awaiting official Microsoft certification, your system or antivirus software may sometimes show a warning for the IGC.dll and game.exe files.

Don’t worry - our client files are 100% safe and do not contain any viruses or harmful software. These warnings are false positives and can happen with newer game files.

To make sure the game runs without any problems, please add the Flame MU folder to the exclusion list of Windows Defender and any antivirus program you are using.

Thank you for your understanding, and we hope you enjoy your time in the game!

Installation & Security Guide
Step 1: Add Flame MU Folder to Antivirus Exclusions

â–¶ Open Windows Security and go to Virus & threat protection.

â–¶ Click on Manage settings.

â–¶ Scroll down to Exclusions and select Add or remove exclusions.

â–¶ Click Add an exclusion, choose Folder and locate your Flame MU installation folder.

Windows Defender exclusion Windows Defender exclusion Windows Defender exclusion
Step 2: Disable Smart App Control

â–¶ Open Windows Security from the Start menu.

â–¶ Navigate to App & browser control.

â–¶ Open Smart App Control.

â–¶ If it is enabled, turn it off.

Smart App Control settings Smart App Control settings Smart App Control settings Smart App Control settings
Step 3: Launch the Game

â–¶ Start the game normally from the installation folder.

â–¶ The game should now run without any security warnings or blocks.





Having problems with square game font? If you see squares in the game instead of text, then you are missing windows font called Arial Unicode MS. It's a common error in all new mu online clients so follow the easy steps listed below to fix.

Step 1: Download missing font ARIALUNI.TTF
Step 2: Double click the file you just downloaded and choose Install
Optional: Alternatively you may download the missing font and copy it to C:/Windows/Fonts

System Requirements

  • MINIMUM
  • Windows 7
  • RAM: 2 GB
  • RECOMMENDED
  • Windows 10 or higher
  • RAM: 4 GB or higher
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