Hi Mike,
Checked the registry, there were 2 hashed keys that contained similar contents mentioning MobileSheets Companion in the Uninstall key.
Not being sure what to do I tried to simply install the new version and still got the error.
So, Uninstalled from control panel and both the hashed keys disappeared - good - try again, still the same error.
Should I do a system restore and manually delete one of the hashed keys and then try to install over the top?
I can't find a Zubersoft or MobileSheets or Companion subdirectory under "Program Files" so I assume the uninstall correctly removed everything that was there.
Oh yes, I disabled my AV software while doing all this.
Checked the registry, there were 2 hashed keys that contained similar contents mentioning MobileSheets Companion in the Uninstall key.
Not being sure what to do I tried to simply install the new version and still got the error.
So, Uninstalled from control panel and both the hashed keys disappeared - good - try again, still the same error.
Should I do a system restore and manually delete one of the hashed keys and then try to install over the top?
I can't find a Zubersoft or MobileSheets or Companion subdirectory under "Program Files" so I assume the uninstall correctly removed everything that was there.
Oh yes, I disabled my AV software while doing all this.
You're only paranoid if you're wrong 
I'm using an Onyx Boox Tab X, and play low brass: mainly 'Bone and Tuba