Can't download it on windows, it asks for an extractor that costs $25.00
Can't you download the Windows version from the page?
That is strange and I don't know what it is due to, but I will provide you with the link here so you can enjoy the game.
https://www.mediafire.com/file/uj7n4o9xwf3klxm/Cachip%25C3%25BAn_with_Waifu_0.2.2.rar/file