Today I had an issue in an RDSH Farm environment, on Windows Server 2012 R2 with User Profile Disks enabled, when users trying to install Google Chrome extensions get the error “Could not install package: ‘COULD_NOT_GET_TEMP_DIRECTORY'”. This is an issue for several years already with any type of dynamic/mounted volume anywhere in the path of %temp%, %userdata% etc. What Chrome does is take the path specified in your case c:\users\%username%\appdata\local\chromeDataDir asks the os to dereference it to a canonical path which turns into something like \?\\HardDisk2\Partition1\…