When you execute pip install gamspy, it creates an executable on your machine (e.g. gamspy.exe on Windows) which acts like a regular commandline script. This means that it cannot be signed by us. Therefore, Windows Defender sometimes thinks that it is probably a malware. Because of this issue, when you run commands such as gamspy install license <license_path>, Windows Defender blocks the executable. A workaround is to run python -m gamspy install license <license_path>. Another way is to whitelist gamspy.exe executable on your machine. Since GAMSPy is open source, to make sure about the safety of the executable, one can check the following script which GAMSPy uses: script.