@3Dtisk2ZBRJ Can you please try the below?
1. Make sure that Fusion installer is not running in task manager
2. Go to C:\Users\user\AppData\Local\Autodesk\DELETE the following folders – Webdeploy,Web Services, Identity services, Autodesk Fusion 360
3. On your desktop or where ever the Fusion short cut is please delete that too
4. Do not use the same Fusion installer. Can you please download the installer again? (make sure that 360 is not found in the installer name)
5. Now install again
