With Manga Life WIN's demise announced in October, Pop Team Epic made its way to the new unified website, TakeComic! But if you were to check the source listed here, you'd find it has since been removed.

TakeComic's approach to comics like Pop Team Epic is far more restrictive than Manga Life WIN was - it goes by chapter rather than individual 4koma (which also means that they're hosting the volume versions instead of the web version of past 4koma), and after each month's run is released, they just immediately make it inaccessible. So if you just happen to forget to check out the newest 15 4koma on the 15th of the month, then you're fucked. It's why bkub himself has to pick up the slack on Twitter now.

Their approach also means that you cannot check out the starting 4koma of each volume anymore like you could before, only those of the first volume (as well as the final two of the previous volume) and then you have to start using your TakeComic! account for the rest.