Hello everyone,
I also had the same problem, terrible, crash when opening max 2024 and 2023 with plugin version 5.3, and nothing to do.
I ended up finding a solution that works for me.
After doing various tests I edited the following script, DatasmithPostStartUp.ms
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C:\ProgramData\Autodesk\ApplicationPlugins\UnrealDatasmithMax\UI
Go to the last line of the script, “Datasmith_OnLoad true UnrealEnginePath”
Replace “true” with “false”
So it should work like this, “Datasmith_OnLoad false UnrealEnginePath”
I didn’t know what I was doing but it worked, I can export a .udatasmith from Max 2024.
Then , if nothing happens by clicking on export . Try to change your Max workspace, that’s what I had to do, my 3ds Max default workspace looked corrupted.
The only other choice I did was to install unreal engine on disk C, because mine were installed on disk B, and at that time, even version 5.2 didn’t work. But certainly the first stage is enough.
I hope that helps some.