While upgrading from one ITMS version to another via Symantec Installation Manager (SIM), one of the MSIs fails to install. Looking at the MSI log the following error was noticed:
Error 1606: Could Not Access Network Location
ITMS 8.x
This issue may occur if there are incorrect settings in one of the following registry subkeys:
In order to fix this issue, please refer to the following Microsoft article with information on error message "Error 1606" and how to resolve it: Error 1606: Could not access network location 0
In this particular example, the issue was that the "Favorites" reference was missing. In the registry, under HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders\, the setting "%USERPROFILE%\Favorites" was added into the "Favorites" regkey.