Medieval role-player Kingdom Come: Deliverance launches tomorrow for PC, PlayStation 4 and Xbox One with a big day-one download.

We popped the PlayStation 4 disc in and were greeted with a 28.7GB download notification - although we haven't got an Xbox One copy to hand to try the same.

On Steam, we also got a 20GB download notification - although by the time it launches publicly tomorrow you may just be able to download a single, updated version there.

"The production realities of game development mean that a 'release' version has to be finalised some time before the actual release date," executive producer Martin Klima told fans on the Resetera forum. "We could have used this time to get some rest, or we could use it to create some additional content and sell it to you as DLC, but we went back to the version-to-be-released and worked on it.

"The results are obvious: quests are more balanced, RPG progression is smoother, the game runs faster and every facet of the game got more polish. The drawback of course is that most of the data in the old build was replaced and has to be downloaded as a patch. At a hefty size, it's going to take some time to download and it's a shame. Still, we strongly believe that after four years wait it will pay off to wait a little bit longer while the Day 1 patch is downloading. Trust me, it will deliver the awesome experience YOU deserve!"

This is how updates often work - if you change a set of files within a certain part of the game, you often have to simply redownload the entire section. In Kingdom's case, this amounts to much of the overall game - replacing the original on your hard drive.

After a couple of delays, the ambitious 'dungeons and no dragons' RPG is finally just a couple of days away. It promises a nerdy amount of realism (down to rotting food and stats for your clothing layers) and has Bertie very excited. He's currently playing it, a couple of seats away from me, for review. Look out for his write-up soon.