This is the error I get on version 2019 and the 21 is the same but with another version...
"Could not load file or assembly 'Seagull.BarTender.Print, Version=220.127.116.11, Culture=neutral, PublicKeyToken=109ff779a1b4cbc7'. An attempt was made to load a program with an incorrect format."
This is the version of the .dll your install.
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