To download the other ones you need to make a folder in the versions folder for minecraft and put the client and JSON file for the versions in there. They all need to be named the same aside from file extensions. Once you do that, you will be able to choose that version when making a new profile with the minecraft launcher.
I want to detect if player is above mob by 2 or 3 blocks (sorry for bad english)
Post this in the redstone discussion section next time...
/execute as @e[tag=<tag_here>] at @s positioned ~ ~2 ~ if entity @a[distance=..1] run ...
Remember those versions that minecraft pranked us with? Specifically:
Those are still downloadable! Watch this video for 2.0:
https://www.youtube.com/watch?v=PQdu9LKAdIU
To download the other ones you need to make a folder in the versions folder for minecraft and put the client and JSON file for the versions in there. They all need to be named the same aside from file extensions. Once you do that, you will be able to choose that version when making a new profile with the minecraft launcher.
15w14a is on this link:
http://minecraft.gamepedia.com/15w14a
1.RV-Pre1 is here:
http://minecraft.gamepedia.com/1.RV-Pre1
Minecraft 3D is here:
https://minecraft.gamepedia.com/Java_Edition_3D_Shareware_v1.34