Revit LT 2025 / Installation keeps failing / error 1603

[josteeno]

Hello,

I am trying to update my Revit LT to the newest 2025 version, but it's failing everytime. The installation starts and goes untill +/- 18 %, but then the percentage goes back to 0. 

Everytime I am getting this error: "Install error: Revit LT 2025. The install couldn't finish. Error 1603."

I found this support page:

https://www.autodesk.com/support/technical/article/caas/sfdcarticles/sfdcarticles/Error-1603-during-...

Already tried Clean uninstall and reinstall the Autodesk Desktop Licensing Service, Remnants and residual files of previous installs, Uninstall and Reinstall Microsoft Visual C++ Redistributables, Windows TEMP folders are full

But the installation keeps failing.

In attachement the install log file.

Please help me, because I'm getting desperate and can't continue working...

[mdavis22569]

Hi @josteeno 

Can we try the following:

Can you download both of these:

P1:

https://efulfillment.autodesk.com/NetSWDLD/ODIS/prd/2025/RVTLT/0A79D52A-BF9F-3650-BB68-74B632AB815E/...

P2:

https://efulfillment.autodesk.com/NetSWDLD/ODIS/prd/2025/RVTLT/0A79D52A-BF9F-3650-BB68-74B632AB815E/...

While they are fully downloading:

Can you clean out your %temp% folder

Delete the prior installers you downloaded for 2025 Revit LT.

(in the Download and c:\Autodesk Folder)

Once both are fully downloaded, can you double click on the 001_002 and start the installer. 

Please keep us posted on the progress. 

[josteeno · Accepted solution]

Hello,

I had also contact with the Autodesk Customer Service, live chat. They discovered some problems in the install log file., and changed some file locations in some shell folders (to the local C disk instead of external hard disks). After that they completed the installation and everything works fine now.

Thanks, Jo