Why does UP2date show different updates in AWS?

Question

We currently have a Sophos UTM instance in AWS. It is a pay as you go (PAYG) pricing model instance. It has firmware version 9.500-9 installed. This version was offered by UP2date. 
 On a Bring Your Own License (BYOL) instance, UP2date offers only up to version firmware 9.413-4. 
 I did a test: I launched a brand new PAYG instance. It started up with firmware 9.411-3. After UP2date checked for updates, it says that 4 updates are available: 9.412-2, 9.413-4, 9.414-2, and 9.501-5. 
 So why is the PAYG instance UP2date offering firmware up to 9.501-5 while the BYOL instance UP2Date is only offering up to 9.413-4? 
 I need to know because we need to move from the PAYG instance to a BYOL instance.

BAlfson · Accepted Answer

If you have a good backup from 9.413, I would move that to the BYOL instance and stay there. There are some small issues with 9.414 (not recommending that to my clients yet) and bigger issues with 9.5 at this point. 
 If you really want to get to 9.501, try the command line approach . 
 Cheers - Bob

BAlfson · Answer

Yes. 
 Cheers - Bob