To properly understand, I replicated what Graham did, and sure enough, if you accidentally delete a recently downloaded replay, you can't immediately download it again [3rd clip shows a tick suggesting it had already been downloaded, even though I had deleted it at this stage].

The ONLY way that I got it to work was to click on the cog, and to hit the App version #, which in turn caused the App to refresh and reset, thus reenabling the option to download again. I shared this with Graham and this was his response [4th clip].