My ST shows v22251 on the vehicle screen but Ford Owner site shows my vehicle is up to date with v23088, but won't offer any update download.
Called SYNC Support, the guy there was laughing while chatting and he simply said "yes we know its an issue, Im being told to refer you to the dealership".
BTW OTA (Over the Air) is generic term that simply means the update is pushed out wirelessly with through cellular or WiFi, it's used on any vehicle with a modem. Our vehicles with SYNC3 have modems and can download OTA for all updates if that's the method chosen. Due to its poor execution and lackluster performance most chose the USB methods. Ford does try and define their proprietary OTA method as something exclusive to SYNC4 but its not, its generic.