It's important to note that remote.it does not replace Mac Screen Sharing, VNC or Windows Remote Desktop. You still have to have a suitable server program on the device side and a compatible client on the PC you are using to view the remote computer's GUI. remote.it does not supply either of these pieces of software. As there are several choices available, this table points to articles which will help clarify which approach you might wish to use and any trade-offs associated with each choice.
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Some editions of Windows (e.g. Windows 10 Home) do not support Remote Desktop Server. In that case, you will need to use a different remote connection software, such as VNC (Virtual Network Console) if you wish to connect to that PC. Here are a couple options:
TightVNC: https://www.tightvnc.com/download.php (free)
RealVNC: https://www.realvnc.com/en/ (free trial)
All current versions of Windows (10/11) support the Remote Desktop Client.