For anyone interested in getting into Koikatsu, you can download the latest full repack here:
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.
The pack contains the game (fully translated), with all the dlcs, bug fixes, graphics optimizations, extra h animations and a ton of others things. It's free of course. You can follow the creator's (ScrewThisNoise) patreon in case you want to support them. When the torrent finishes downloading, you just extract the folder from the zip file (keep in mind that the game might take 40gb or even more space). There is no installer. After that, you're pretty much done. All that's left is to find what cards you want. You usually download from pixiv or
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(that's where I mostly get mine) or you can just simply google "koikatsu cards". Hope that helped.