I'm unable to install or open Fusion after the latest update, I've tried all the steps in your troubleshooter and it's still not working.
Hello @marko.m.sch,
There are more Fusion 360 logs you can collect to help resolve the issue, but the first error presented in
| ERROR_UNKNOWN_PRODUCT | 1605 | This action is only valid for products that are currently installed. |
Conduct a Clean Uninstall of the previous installation & use the MSfixitTool to complete it.
Please "Accept Solution" if a reply or replies have helped resolve the issue or answered your question, to help others in the community.

Natasha
Community Product Support Specialist
Helpful Links:
AutoCAD Videos | AutoCAD Crashes or Freezes | AutoCAD Customer Council | AutoCAD System Requirements | Prepare your computer for download | Autodesk Virtual Agent | Clean Uninstall | Steps for Setting-Up Student Software
Hello Natasha I've tried the mentioned step "Conduct a Clean Uninstall of the previous installation & use the MSfixitTool to complete it." but Fusion still wont install, any help would be appreciated.
¿No encontraste lo que buscabas? Pregúntale a la comunidad o comparte tus conocimientos.