If you have a copy but it won’t run or patch ISOs correctly, try these fixes:
To get a clean copy of Beta 10, use these community-preserved locations: xdvdmulleter beta 10 download fix
File signature check: The legitimate .exe should be approximately 1.2 MB with a digital signature dated around 2006–2008. Always run it through VirusTotal if uncertain. If you have a copy but it won’t
If you skip this, the program will crash immediately. You need to manually register the VB6 common controls. File signature check: The legitimate
Verification: Open XDVDMulleter Beta 10. If it loads without the "Error 339," you have completed 50% of the fix.