After upgrading to App Control Server 8.1.4, uploading a new agent installer to the server fails.
The C:\Program Files (x86)\Bit9\Parity Server\Support\HostPackageInstall*.log may contain "ERROR: Unable to back up files"
This happens because during this process, App Control runs a backup of the Parity Server install directory "*\bit9\Parity Server" to the local user's temp directory. If it runs out of disk space during the backup the install will fail.
Stop the App Control Server service
Delete any ####.tmp files or folders created in this directory:
Run the most recent host package installer exe file