Thank you for reporting your issues. Can I have you both run the mb-check tool from https://downloads.malwarebytes.com/file/mb3_check and provide the mb-check-results.zip
Also provide all "Uninstall Log" from your temp folder (%temp% or C:\Users\[yourusername]\AppData\Local\Temp)
The uninstall logs you'll be looking for will look something like this: "Uninstall Log 2017-09-01 #001.txt"
Even if you have already resolved your upgrade issue, I would like to analyze the underlying causes of your upgrade problem with these logs.