Could you please run the APIM Interrogator Utility in the Syn3 Updater and post the results? That will tell us what is up with the APIM. Or this… Tutorial: APIM Interrogator Utility - Ford / Guides & Info - CyanLabs Official Community
Also, if you used the Syn3 Updater, post the log file.
In the form above you posted old and new version the same. Which version were you trying to upgrade to?
From you description, I guess you have read this tutorial… Tutorial: Sync 3.4 NON-NAV APIM: Failure to Update to Newer Version Sync 3.4 - Ford / Guides & Info - CyanLabs Official Community
One last thing, did you program the APIM for the 2015 F-150?