Please install a page file over 32GB, as you can see my memory usage is over 20GB whilst opening the IK Retargeter.
see this post
hi you may need to add a 64GB pagefile.sys, which I documented in
Install a bigger pagefile.sys
Then everything works without crashing.
34.00 needs more virtual Memory for most of the Feature examples and now with the latest UE5.6 updates, which UEFN is based on .
Tried The video
Mixamo to Fortnite Using IK Rig Retargeting
and with this 32GB there are not no crashes.
Check that in Windows 11 your project does NOT have OneDrive in its path, often UEFN will crash.
There is a warning message on new project creation but no checks on older projects