I am now working on a big Realistic JAVA pack 2.0 update. Here are some screeshots with the new ferns, leaves and grass. Version 1.xx is just a tweaked conversion from Bedrock for JAVA. This update will make more use of the options that the JAVA version allows. You have a lot to look forward to.
RealSource JAVA pack works on all Minecraft versions !!!
Sorry for the more complicated setup of the version you need. Doing all the versions with every update is unrealistic for me in terms of time. Open the downloaded .zip file and inside you will find the pack.meta file. Open it in any text editor. In the line pack format, edit the number according to the version you need (from 1 to current 31). You can find the necessary number at this link.