That's weird. I've just downloaded the Windows file from here and got a 1.9GB file which unpacked correctly with 7-zip.
Yeah I'm not sure what's up then, I figured it was something to do with the mega link since I got one to work but not the other. Either way, might be smart to advertise a mirror link or something in case anyone else has an issue.
Great game btw, you do a great job at throwing in a lot more plot and philosophy in there rather than it just being a bunch of sex scenes. Will definitely be following your other projects if you're working on any other games.
Thanks! I'm currently working on an erotic science-fiction project which contains a lot of the same kinks found in Sisterly Lust: https://perverteer.itch.io/tales-from-the-unending-void