Hi, thanks for the link, it was indeed easy.
Personnally, when I click the snapshot button to modify my version of the game, I get automatically version 20w14a (this link : https://aternos.org/software/v/snapshot/latest ) instead of the link you mentionned.
And lastly, do you know if the 20w14 infinite version will always be available ? Since I only see three options in your link, I'd like to know