First off, If you are on Windows and have GWS 2.0.1 uninstall it and get the GWS 2.0.0 version. Same download page it is under previous versions.
You need a Distributor Certificate as well as Authors make both Distributor and Author Certificates the same password. To get the distributor certificate you need to connect by WiFi to your watch. Tizen 5.x does not support bluetooth debugging.