bruh, iOS doesn't allow apps not on apple's appstore to run on iphones or ipads. The apple device this game runs on is Mac not iphone.
You can buy a cheap used windows pc on Facebook marketplace or ebay or newegg.com. it'll work just fine but get one with at least 4 gigs of ram and 500 gigs of storage. (If you plan to play Skyrim on full graphic fedelity on it, you'll be fucked if you do) happy gaming!