Thanks for your interest in My Recipe Book! This app has had a good long life, but unfortunately we are no longer able to support the app and it is no longer available to download in the App Store. Your data should still be useable on your device, and RecipeSync will still allow you to back up your recipes until January 31, 2021.
There are many options, but may we recommend you transfer your recipes to the app Paprika? It has much of the same functionality and there's a way to convert/import your recipes from My Recipe Book into Paprika. For details on how to do this, check out this help info from Paprika's website: https://paprikaapp.zendesk.com/hc/en-us/articles/360044840474-How-do-I-import-recipes-from-My-Recipe-Book-. You shouldn't even have to open My Recipe Book app in order to do the transfer!
Note that we aren't directly associated with Paprika and aren't endorsing them specifically, but their app seems to be a good one and it offers an option for a smooth transition for our customers. There may be other apps out there that will do the same thing! Feel free to investigate them all.
Thanks so much for being a loyal user of My Recipe Book and we wish you happy cooking and baking for years to come!