As you already finded out yourself, this problem isn't so easy to fix atm. All your findings are valid, so i see 3 different options for you.
1. Disabling secure boot, which depending of your setup, might go smooth and you only need to go to click one thing on bios and you are good to go or you might get more problems than you ever wanted. It's even stated on microsoft docs about disabling secure boot:
"Warning
After disabling Secure Boot and installing other software and hardware, it may be difficult to re-activate Secure Boot without restoring your PC to the factory state.
Be careful when changing BIOS settings. The BIOS menu is designed for advanced users, and it's possible to change a setting that could prevent your PC from starting correctly. Be sure to follow the manufacturer's instructions exactly."
So,if you are not familiar to your computers bios, it's settings, and how to change them, this already might be problematic enough to just leave it as it is.
2. Uninstalling the latest win10 security update, which imo is more safer/easier way to make your games work, althou this either isn't bulletproof and might lead same kind of symptoms, eg. windows not booting or something else not working normally anymore.
3. Just leave it as it is atm, my.com will update their certificate at some point, they prolly can't afford loose all their players who uses win 10 and keeps their security updates up to date... or if they think they can loose them, there might be another fix for it available in reasonable time.
And i know, some smarta** will come and say, nonoono just do it there is no need to worry at all, this is soo ezzz ploxxx bla bla, but still, i would consider couple times, before going with options 1 or 2 :). I wouldn't value those "couple" bananas over my sanity :p
My advice is to go with "opt 3", wait couple days, see what's coming and if nothing happends, then rethink again.
ps. There is another bananatic user who had same problem with those 2 games and i think he got RO working with thing i suggested him to try... giving admin rights to all files on RO folder (Revelation Onlinegame) which are named tianyu. I just can't remember fully what i told and don't know what he actually did but he got RO working, hopefully he comes online soon so he can cofirm.
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