Release versions of the MobiSquirt app can be downloaded for free from the app store. Simply search for mobisquirt or megasquirt and it should appear and you can install it directly on your phone.
The app requires a minimum of iOS9, very few devices cannot be upgraded to iOS 9 and above and supporting earlier versions makes app development much harder. I apologise if you have one of these very early devices but trying to support them will lead to development stalling again.
Test versions of MobiSquirt are shipped using Apple’s TestFlight app which can be downloaded from the App Store. I will need to register you as a test user with Apple, they will send you an email confirmation and, once you’ve confirmed, the available test versions of the app can be installed.
All I need is your email address and you can be added to the TestFlight users for early access to test releases.