You can use any .jar file you want! On the purchase of a hosting package, you may select from our vast variety of included versions that will be automatically set up. Additionally, all servers receive full access to an online file manager where any .jar file can be uploaded. Modpacks, Spigot, Bukkit, etc. are supported. Misuse of this feature, by running a different game or using more than your allocated server resources will result in account termination without a refund.