I encounter this problem twice this week when running an allwkst.exe for a 2012 server.
One install was 2 years old but the other one had Ledger 9.2A already.

I uninstalled the printer from the printer List, the program list and the registry and uninstalled the GL workstation install . Then, installed Ledger by itself and it completed the installation of the AdagioPF printer without any problem.

Hopefully, this is not happening in newer versions of allwkst.exe.