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Why is the old Space Engine website full of trojans and an popup with sexual stuff
Someone else noted something similar some time ago, only with hentai anime content. Since this enticed my curiosity from a professional point of view I did check for such things then, with no results.
What I did noticed, though, by looking at the code, is that the old website provider (ucoz.net) is apparently affiliated with advertising providers using advanced adaptive profiling software, seemingly guessing surfing habits even without cookie technology, according their marketing sources. I don't remember anymore the company's name, sorry.
It could be a prudent move to clear the cache, history, cookies of all browsers, check the computer with specific adware removers (adwcleaner from MalwareBytes is a good one), do a full scan with an antivirus (possibly not cracked, they're notoriously flawed). As a general rule, avoiding use of warez and porn sites does help.