Aristois

You can't install that old of a version. To use OptiFine with Aristois on 1.12.2 you must run forge.

Install 1.12.2 forge, then run the installer and select "1.12.2" and "forge modloader" and then place Optifine 1.12.2 in your /mods/ folder. Then run Forge from the launcher.

As mentioned in your other post, you can't install OptiFine to 1.12.2 unless you use forge.

The Addons Marketplace is only for 1.14+ fabric.

We do not support TLauncher. Looks like OptiFine is the issue, not Aristois