The links to the GOG.com version do not work for me.
They just lead to the GOG homepage, not the game's page. Also, it can not be found when using the search option on their page.
The link to the download page of Sisterly Lust here on itch.io does not work, it shows a page with an error message:
This page has been blocked by an itch.io administrator for violating the site's content policy.