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If i change Network (internet connection) than also problem?
This message populates when MAC Address/ HOST id in license is not available on machine where you are installing the license manager.
Couple of points to check:
1. License file which you are using is floating license file. "Server" worked needs to be available in license file.
2. Check the host id using ipconfig /all in command prompt and confirmed that one of the physical addresses listed is matching with HOST ID in license.
CHECK article https://www.ptc.com/en/support/article?n=CS23033