I have a user who is having trouble installing an update to our software.
The error he gets is "Server returned unexpected error 1610 attempting to install package ..."
The sequence of event is (apparently) as follows:
He uninstalled his current version manually via Windows Uninstaller (this is not the normal practice - most users update via the AI updater).
He then downloaded and tried to install the new version, and got the error message above.
He then tried to install the older version again, and got an error saying a more recent version was already installed.