The error message "Tableau Setup cannot locate the backup file created by uninstall ..." is typically associated with a change in bitness during install.
When installing the 64-bit version of Tableau Server, the default install location is C:\Program Files\Tableau\Tableau Server\<version> whereas the default location for 32-bit Tableau Server is C:\Program Files (x86)\Tableau\Tableau Server\<version>.
You will find our solution to this problem via our knowledge base, here: Error "Tableau Setup cannot locate the backup file created by uninstall." when reinstalling Tableau Server
We fixed the isse just today,it was actually due to a bad naming of the host (we had a non-ASCII symbol in it, a special dash sign that could not be interpreted as a minus). Everything works fine now, thanks a lot for your help
Best regards, kenavo
Thank you so much for coming back and sharing the root cause with the community and marking the post correct.