Resolved via guilded, however I will leave a reply for others.
On the new launcher, if you don't see a new profile for Aristois, you should try making a new one. Go to the "Installations" tab, make a new one, name it, and then select "release (mcversion)-Aristois".
In order for the donor version to work, you must start the game with the donated account.
On the main menu, go to options > alt manager. You can either type in non-donor account information here, or press "Saved alts" to save it for next time. Then the donation perks will work on the second account
Your image url doesn't work, but this applies for most optifine errors: https://discuss.aristois.net/topic/13/how-to-uninstall-optifine-optifine-error-on-startup
That would make sense. I suppose you could just google "optifine using integrated graphics", as many other people have reported it.
Some possible solutions:
https://www.minecraftforum.net/forums/support/java-edition-support/2902923-optifine-uses-integrated-graphics-instead-of
https://www.google.com/search?client=firefox-b-d&q=optifine+using+integrated+graphics