Cannot get HASS/integration working
Long time user... first time complainer. 
Brand new computer. Installed the agent on windows using https://github.com/hass-agent/HASS.Agent/releases/latest/download/HASS.Agent.Installer.exe
Added the custom repo to HACS (this one right?)
Brand new computer. Installed the agent on windows using https://github.com/hass-agent/HASS.Agent/releases/latest/download/HASS.Agent.Installer.exe
Added the custom repo to HACS (this one right?)

Solution
I've got things working too. The point for me was that in core.config_entries file there was a persistant hass_agent entry. Even when I deleted the integration, it stayed there. This entry was a wrongly used name by myself (i'd like to add -hassagent to the identifier). After removing manually, it is gone. Thanks for your support!