Idk if I'm allowed to share this in this type of thread but here are the decoders I've gathered for Wolf, RPGM, RPGMV and RPGMZ (most or all of which can be found in this site too).
For RPGMV you will find 2 different programs "RPG_MAKER_MV_DECRYPTER_JAR" and "RPGMV-DECRYPTOR", I find the 2nd to be better.
Simply run the exe, choose the gamefolder (which contains the game.exe file), let it do its thing. If it complains it can't find a file called System.json then use the 1st decryptor, this one will require some extra steps because it will output to a folder called outputs in the decryptor folder which means you have to copy those outputs to the game folder and you will need to manually find the System.json, usually in www/data/ and edit a line that states "hasEncryptedImages":true to "hasEncryptedImages":false ).
The 2nd decryptor will copy the decoded .png files to the correct folders and automatically change that line for you which is why I prefer it.
Now, idk if it's required but I did go around and delete the original rpgmvp files since they were no longer needed, if you wanna test it before hand just find the rpgmvp file that contains the title screen, usually contained in www/img/title or in this case www/img/title1 and delete it. Run the game and if it still shows the title screen that means it's loading it from the decoded png file
. If it all went well, all you need to do is copy those decensored images to www/img/pictures and overwrite when asked. From my experience you don't need to encrypt the files to use them, they can remain as .png.