Few days after the Steam release of Sonic the Hedgehog CD, I released a short video showing a proof-of-concept mod with Metal Sonic as playable character. The mode featured a private animation editor (later re-used for RSDK Animation Editor) and was never released to the public.
With the re-release of Sonic the Hedgehog 1 on Android, I was able to crack and unpack the new Data.rsdk format in a short time, extract the animation file from Knuckles and import it into Sonic the Hedgehog CD as a proof that the RSDKv3 and RSDKv4 animation data were interchangeable.
Many years later, with the release of Sonic Mania, various modding communities born. Reddit has one community about Sonic Mania modding.
On 12 Apr 2018, at 09:23:37 the unfinished 1.04 version of Sonic Mania (european version) was uploaded on Playstation's servers by a "mistake".
Using a PSN crawler, I was able to catch the 1.04 update and store it. It never happened that Sony removed game updates from the store, so the link should never die. I downloaded the update file anyway.
In order to download and install it on your Playstation 4, you need to install Charles Proxy, using it as a proxy and overriding the 1.03 update with 1.04.
1.03 version that needs to be remotely mapped:
The most handy way to do that is to go on your PS4 connection settings, set the proxy using the local IP of your PC (look for ipconfig), start to download Sonic Mania from PSN / Library, catch the ppkgo update and replace it with the new one. The following screenshots will help you if you are new on this kind of stuff.