Can't install 8.1 update to my functioning 8.0.15 on my PC

Nuendo
1

When I try to update my 8.0.15 to 8.1.0 on my studio PC, I get the following message:

Nuendo 8.1.0 Update installation failed.
The installation source for this product is not available. Verify that the source exists and that you can access it.
Error Code 1612

I can run 8.0.15 fine, but I’ve tried several times and can’t get 8.1 to install. I also tried re-syncing the dongle. Still can’t install 8.1.0. I’m running Windows 7.

2

I had to replace the original installation files (downloaded) in the original directory (I had deleted them because it was already installed and running). Then I reinstalled and was able to update.