Upgrade Installer from Vembu BDR 4.0 to 4.1 crashes

I'm having an issue currently with trying to update my installation from 4.0 to 4.1 Each time I run the installer, I agree to the terms and conditions, press next, and then the installer quits.

I've tried restarting the PC, re-downloading the setup file (in case the previous one was corrupt), and stopping/restarting the Vembu services - but nothing has worked.

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