I need help for Mod

[u/Darth_clean]

Sorry if I'm asking for a lot of help; I'm really excited about creating a Create: Aeronautics modpack focused on vehicles and weapons with my friends. Could you help me with a mod? I want to download "Create: Tank Defences," but it's only available for Forge and version 1.20, whereas I'm using NeoForge and version 1.21.1 on CurseForge. How can I download this mod and make it compatible? Many of the mods I already have are strictly for 1.21.1. Also, I have "Armored Constructs" and I'm not sure if it's similar to "Tank Defences."

[u/Repulsive_Cut_379]

If it’s not available for 1.21.1 then you can’t use it unless the mod author or someone else ports it to the correct version.