Back in 2011, Apple built a web-based demo of the upcoming OS X Lion to preview iCloud features. A static, archived version of that demo does exist, but it only simulates the and Mail interface, not the full Finder.

If you truly want to relive 2011, buy an old Mac mini (Mid 2011 model) on eBay for $50. It will run Lion natively, with no simulation required. That is the only real simulator that exists—the actual hardware.

Released in July 2011, Mac OS X 10.7 (Lion) was a revolutionary operating system. It killed the physical scroll bar, introduced Mission Control, and brought iPad-esque Launchpad to the Mac. Today, nostalgia for that skeuomorphic design (leather-bound calendars, green felt桌布) is at an all-time high.

But here is the hard truth:

If you have spent any time recently searching for a “Mac OS X Lion simulator,” you have likely run into a frustrating wall of broken links, shady download buttons, and YouTube videos that promise the world but deliver nothing.