[Bug]: Pyrevit Installation Issue - Revit crashed on startup

[AlvieTSA]

✈ Pre-Flight checks

• I don't have SentinelOne antivirus installed (see above for the solution)
• I have searched in the issues (open and closed) but couldn't find a similar issue
• I have searched in the pyRevit Forum for similar issues
• I already followed the installation troubleshooting guide thoroughly
• I am using the latest pyRevit Version

🐞 Describe the bug

• Revit crashed on startup when Pyrevit is installed
• Installation of 6.4 version error message. (screenshot below).

⌨ Error/Debug Message

Pyrevit was installed, but the installed could not update the original user PATH environment variable.

You may need to manually add the following folder to your user PATH, or re-run the installed without administrative
privileges:
c:\Users\alavie.tan\AppData\Roaming\pyRevit-Master\bin

♻️ To Reproduce

No response

⏲️ Expected behavior

No response

🖥️ Hardware and Software Setup (please complete the following information)

C:\Users\alvie.tan>pyrevit env
==> Registered Clones (full git repos)
==> Registered Clones (deployed from archive/image)
master | Branch: "master" | Version: "6.4.0.26100+0515" | Path: "C:\Users\alvie.tan\AppData\Roaming\pyRevit-Master"
==> Attachments
master | Product: "2026 First Customer Ship" | Engine: DEFAULT (2712) | Path: "C:\Users\alvie.tan\AppData\Roaming\pyRevit-Master"
master | Product: "2025 First Customer Ship" | Engine: DEFAULT (2712) | Path: "C:\Users\alvie.tan\AppData\Roaming\pyRevit-Master"
master | Product: "2024.3.4" | Engine: DEFAULT (2712) | Path: "C:\Users\alvie.tan\AppData\Roaming\pyRevit-Master"
==> Installed Extensions
==> Default Extension Search Path
C:\Users\alvie.tan\AppData\Roaming\pyRevit\Extensions
==> Extension Search Paths
==> Extension Sources - Default
https://github.com/pyrevitlabs/pyRevit/raw/master/extensions/extensions.json
==> Extension Sources - Additional
==> Installed Revits
2026 First Customer Ship | Version: 26.0.4.409 | Build: 20250227_1515(x64) | Language: 1033 | Path: "C:\Program Files\Autodesk\Revit 2026\"
2025 First Customer Ship | Version: 25.0.2.419 | Build: 20240307_1300(x64) | Language: 1033 | Path: "C:\Program Files\Autodesk\Revit 2025\"
2024.3.4 | Version: 24.3.40.26 | Build: 20250918_1515(x64) | Language: 1033 | Path: "C:\Program Files\Autodesk\Revit 2024\"
==> Running Revit Instances
==> User Environment
Microsoft Windows 10 [Version 10.0.22631]
Executing User: SCANLAN\alvie.tan
Active User: SCANLAN\alvie.tan
Admin Access: Yes
%APPDATA%: "C:\Users\alvie.tan\AppData\Roaming"
Latest Installed .Net Framework: 10.0.6
No .Net Target Packs are installed.
Installed .Net-Core Target Packs: v10.0.202
Active CPython Engine Version: 0
pyRevit CLI v6.4.0.26100+0515.06e6e8108e8aaccfbb7080163a437e19236a8533

Additional context

[jmcouffin]

Have you tried any of the instructions provided by the installer window?

• running the installer without admin rights
• adding the path to the PATH environment variable?

If you haven't, uninstall and try the first suggestion