Need software update.

tlto wrote:

I have iPad mini model MD531LL/A. Software v9.3.5 that the device says is up to date.

That is correct. You have an original iPad Mini (1st generation), which was released in 2012. iOS 9.3.5 is the latest version of software this device can use.

tlto wrote:

I need an app that requires v10. How can I update to that version?

Purchase a newer iPad.

UPDATE - Sorry, I was not aware there were any replies before mine until after I posted the above.

Your iPad model cannot update beyond v9.3.5.

If you want to run apps that require the latest iOS version, you will have to purchase a new iPad.

You have a 1st gen IPad Mini.

A 1st gen IPad Mini cannot be upgraded/updated past iOS 9.3.5.

Sorry.

Try looking under Settings>General>Software Update to see if your device has a compatible update. Not all updates always appear with a notification in Settings and some older devices are not compatible with later versions of iOS. See this support article for more information on updating iOS devices. I hope this answers your question, but feel free to let me know if you have any further issues!