Alright, got everything figured out! To get acceleration working under 10.14.4 with a non-Metal GPU, just download this archive, extract it, cd into the extracted directory using Terminal, and then run ./install.sh. Please ensure you have the Legacy Video Card Patch installed properly (you can re-apply it with the post-install patch, or re-install it using Patch Updater after running the script just to be sure). After rebooting, you should now have full graphics acceleration!
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Hello I don't know how exactly how to run this, I cd right but what I should next to run ./install.sh