correct, sadly iOS is not supported since we can't get an erotic game on the app store, apple doesn't allow that, so we didn't even try

And I don't know of a way to install apps on iOS without using the appstore, as far as I know it only works through that source (not sure, maybe with jailbreaked phones you can install from other sources? )
Did you watch the video? Did you read the how to in the install tutorial? It's pretty self explanatory, you can either download:
0.4.4.1 Base game and then update from there ->
0.4.4.1 to 0.4.5.0 -> 0.4.5.0 to 0.5.1.0 -> 0.5.1.0 to 0.5.1.1 -> 0.5.1.1 to 0.5.2.0 -> Patch v0.5.2.0 to v0.5.2.1 Small Update or Full Version v0.5.2.0 needs to be installed before installing this update
or you can download the
v0.5.2.0 - Full (Uncompressed) -> Patch v0.5.2.0 to v0.5.2.1 Small Update or Full Version v0.5.2.0 needs to be installed before installing this update
or you can download the
Official, compressed, pre-patched version -> Patch v0.5.2.0 to v0.5.2.1 Small Update or Full Version v0.5.2.0 needs to be installed before installing this update
OR you can download the
Unofficial "Crunched" Compressed Full Version -> Patch v0.5.2.0 to v0.5.2.1 Small Update or Full Version v0.5.2.0 needs to be installed before installing this update
Edit: Once you've downloaded the files you wanted (First option is the same as the second option but in smaller parts..) you start extracting them from lowest to highest version number. When you're done you can copy the wickedchoices-pc folder to wherever you want and then start playing