Where download?
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Where can I download a working version with aristois 1.12.2 and optifine 1.12.2? For example this
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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.