help 64-bit 1.8 version

[Morthlog]

In order to allocate more than 1 gb of ram (cause the game kept crashing) i wanted to change to a 64bit- version. The only one available was 1.14 which was saying it is known for causing problems. I tried to lauch pixelmon reforged with it but i just wouldn't open. I tried to find a version (preferably 1.8) in .minecraft folder to get the version, but i could not find the javaw file it needed. Below is a picture with my version option. So what i need is either a guide or a link to get the needed file to get the 64-bit version of 1.8 to 1.12. Anything in between works for me

 

Edit: The problem has been solved. This thread may be closed by the moderators

Edited August 31, 2020 by Morthlog
Problem solved

[TerdyTheTerd]

Install the version you need, get it from the java downloads page. Unless you need 3 versions installed I would say uninstalled the other two versions fist, then install the new one.

[Morthlog]

Could you provide me with a link since I do not seem to be able to find it

[Lord Ptolemy]

https://java.com/en/download/manual.jsp