Hello Aternos Team, Marissa here!
Can you please add the mod "Beta Days"?
Link to the mod: https://minecraft.curseforge.c…=mc-mods&projectID=247840
The mod was created by Modding Legacy, authors of the famous Aether Legacy mod. Beta Days adds new commands to the game, which allow admins to alter the way the server functions, to bring back certain aspects of Beta Minecraft.
I believe that, due to your choice not to include the beta or alpha versions on your platform, this is the most fair and appealing alternative, and I hope I can use it with my boyfriend very soon! 
Thank you.