Good thing you have removed the links, you already know this ISO is pirated and it originally belongs to
@TOSanthony, he used to publish his Android-x86 TV builds in Discord where he can make his ISOs paid, he cannot do that here hence why you can no longer see his builds here.
Also, you have mentioned that you were about to downgrade to Android 7.1.2, which TOSanthony published for free in XDA back in 2017 (until 2018), with an excuse of being "more stable and functional", and by the way I request from XDA moderators to remove this thread and its blog too.