It is UEFI only, still on first stages of development, the first version was released on 2020-11-19, so in your case, that you use your RamOS for everyday use, I suggest to wait a few more time to let the developer(s) fix certain details that are still under test.
This is IMHO the best place to look for the officially released versions: http://grub4dos.chen...-4-6a-for-UEFI/
I will add this link to post No. 121 too.
alacran