Yes, I am aware. It's crashing because you do not have OptiFine in your mods folder (it is searching for it, but can't find it). Please follow the guide I sent to uninstall OptiFine.
Are you implying that you have the same issue? If that's the case, then you have to do what is said: https://discuss.aristois.net/topic/23/invalid_checksum-error
It will work if you do it correctly. I also can't help if you are not using the official launcher
Unfortunately, we do not control what appears on the adfly pages. Never click on anything except for "Skip Ad". These pages cannot harm your PC unless you download and run something, so you can simply close the browser and you do not have to worry.
You can use this direct link to skip the adfly page: https://aristois.net/ui-installer/free/.
Hello, we do not support PayPal, only Stripe and cryptocurrencies. You can read more about Stripe as a company in this post: https://discuss.aristois.net/topic/515/stripe-faq-and-concerns-donation
From the log, it looks like a particle crash from "falling leaves" by cheaterpaul.
Additionally randompatches and BYG are mod conflicts, and Aristois will crash with them installed.