Seems there are only DEB and RPM packages… and no AUR Package which converts it… Will be a bit difficult for a newbe. But in general as I see it is a electron app. Just download the DEB package extract the data.tar.xz and inside the folder opt/remotepc just run the binary in the terminal:
cd path/to/opt/remotepc/
./remotepc
That is easy, since there is native app for linux:
pamac build anydesk-bin
(pamac, the default package manager on Manjaro, has also support for AUR, you just need to enable it)