Ok so we managed to install it on an iOS14.4 phone using a cloud mobile testing service and it crashed there too. Unfortunately the app still has to support versions as old as iOS12 so raising the minimum to iOS14.5 is not that feasible. So what I did instead was to unlink this sdk from the app target and extract all the code that imports it into a separate new framework. This new framework will be the one to link to the sdk and it will be manually loaded(via Bundle.load() if the guard for iOS15 passes, with its utilities created via NSClassFromString .