I have a customer trying to import my company's Dynamics managed Solution and immediately after selecting the zip file they get "An error occurred. Try this action again, if the probelm continues, contact your Dynamics Admin or contact Microsoft Support."
I had them look under the "Solution History" section of Settings and they could see that when trying to import the solution there's the message "Unexpected : ZIP archive contains unsupported data structures."
We've had this managed solution import successfully for many other customers and it's not the usual issues that I've seen with either Invalid XML, or dependancy issues.
Any directions on where to look for guidance would be appreciated.