Inventor Nastran 2026 can be installed from Autodesk Access, in which case the default install location is on the C: drive. Inventor Nastran 2026 can also be downloaded from manage.autodesk.com, in which case the default install location is on the C: drive, but you can choose to browse to a different location if desired.
Nastran Registration with HeliusPFA after installation
When Inventor Nastran is installed after installing Helius, you needs to run the FEARegistrationutility.exe in the admin mode. This will update the file spec path and copy the necessary files to the Nastran folder.