We have this issue on only one of our development machines. I am not sure if this helps, but the problem seems to be solved by changing registry. In our case, the registry key had 8.3 name in the path to the dll file, and the issue is solved by changing it to the actual path. PeachTree Accounting 21.0 Type Library showed up in COM list in Add Reference dialog, and the error at GetApplication was resolved. The error at LogInSelector was still thrown after changing the registry, but it is resolved by opening Sage 50 before LogInSelector is called. The machine with the issue does not have 8.3 name assigned to Program Files folder where Sage 50 is installed.
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