Thanks for the reply this really got me a step further! It sounds noob-ish, but I've changed some variables for the latest version of Java.
I know the latest Java is 1.8.0_211
This are the things I've tried and that made the most sense to me:
https://imgur.com/a/QhBBr2Y
I know from Scu11 his tutorial that if the java version starts with an 1 then the other numbers are <release>.<update>_<patch>.
He also said that I need to use the offset index. I don't know if this is already done in this client or if it is something that I need to do manually.
I can't say it enough but I'm really gratefull with all your support!!
I also really appreciate it that you let me learn it by myself and don't give it right away!