A client of ours recently needed to upgrade 2020 ... got the download, installed. The client comes back to me & says they need access to 2019, which WAS(with the last 10 years versions, which seemed to all to have been uninstalled or removed) installed on the server that 2020 is on, but when I try to install from a copy of the CD, I keep getting Installation Halted, The share file path is being updated. 

I found this article ... 

https://proconnect.intuit.com/community/help-articles/help/error-when-updating-shared-file-path-is-b...

Is it OK to get this path from 2020 & then delete all the files? Any ideas, assistance. 

This install has been way harder than it should have been ... LOL 

TIA