A kindly user alerted me to purchase difficulties with the latest update and on looking at the data I was able to confirm that I’d broken the receipt validation process when the app transitioned from my company account to my personal one 🙁

The update containing the fix is now with Apple for review and should hopefully be in store in a few days, or less if we’re lucky!

[UPDATE] 1.6 is now available for download and a user has kindly confirmed that this fixes their issue.