i have this qustion too

i wanted to play as jpark t-rex but not found it in modded dinos

yeah

If you are on sp, then there should be a settings for play as dino when you press esc. Inside of the settings, there is a get all modded dinos button, but that is sadly broken atm. For now, all i think you can do is copy and paste the (long) classpath into the dedicated space to get said dino (also within settings if that was not obvious already lol). If you cannot find the long classpath, I think you guys just have to wait until Finn patches the issue with the get all modded button. (no hate meant here, i know that there are other bugs of higher priority he must patch first.)