pyRevit 5.1 fails loading IronPython 2.7 on Revit 2025

Hi!

I’m currently testing a set of scripts in pyRevit 5.1 and I noticed this error while loading IronPython:

IOError: [Errno 2] Could not load file or assembly 'IronPython, Version=2.7.12.0, Culture=neutral, PublicKeyToken=7f709c5b713576e1'. The system cannot find the file specified.

Suprisingly, this only happens in Revit 25 and works in all other versions, including 26 :smiley:

The assembly exists at the specified location and the Python engine is set to 2712 in settings:

Thanks in advance!