Well, normally it shouldn’t happen but it seems it did. Beelink normally should have pre-flashed some devices for us. @spikerguy will get in contact with you and sort it out. Use a Balena-Etcher, zap it on an USB-stick, decide if you want to keep the Windows install on setup and get Manjaro installed. Since it is an OEM ISO you will setup the user on second bootup.