Server Component Installation Failed - exit code 4

Win8.1 Pro, SB 7.6.0.36, SQL Server 2014 Enterprise and Express (with ADV) on the machine.

Uninstalled server components because the UI complained of a problem with a server dll.

Attempted to install from the UI and the message below was emitted.

I clicked the "Details" link but no dice, so went to the page manually.

There is no exit code 4 documented, so I'm clueless what to do next...

Help, please.

BTW: All I want to do is deactivate the license so I can use it on a QA server...

Code:

<<windows 8.1 Pro Laptop>>: Server Component Installation - Failed ================================================= Copying and running SQBServerSetup - Failed ------------------------------------------- Error running installer: exit code 4 See http://www.red-gate.com/sqlbackup/install_errors for more information. Starting SQL Backup Agent service - Pending ------------------------------------------- Operation pending. Checking installed versions - Pending ------------------------------------- Operation pending. Checking SQLBackup extended stored procedures - Pending ------------------------------------------------------- Operation pending. Verifying installation - Pending -------------------------------- Operation pending. Updating SQL Server information - Pending ----------------------------------------- Operation pending.