Have you not been able to get the games to work? As you know, FlashPlayer is defunct and all the games use Flash. So, what's the work around?
Ruffle
Install Ruffle on your browser, and you will be able to play the games here. I am not sure if it works on all the browsers, but it works on Firefox at least, as that is where mine is. It was a quick installation and has caused me no problems. The security issues that FlashPlayer had are solved with Ruffle as well, as I have read.
I will put the link to Ruffle here, but you can find it by Google as well.
There may be other programs like Ruffle that will also work to play these games. I have seen at least one other used on another site. If Ruffle can be installed directly on this site, you won't need it on your end, but, for now, nothing is installed on this website to play in Flash. So you will need to install something.
There are other problems besides FlashPlayer, however, that Ruffle will not solve. We can't get the player challenges to work for one. And a few games won't post the score (Dumbstruck and Inwords for two). But the games themselves are still as fun as ever and you won't be tripped up having to watch an ad to access them.