This thread will focus on versions before 1.14 that Fabric will have support for. This will be either for showing off what is available for it or just point out it's existence. These are either for mod devs testing or just those that want to use/make mods on old versions.
Current versions supported:
1.2.5 (I think as Fabric Discord Link is available for it, no clue on installer for 1.2.5 though)
Planned, still in Yarn stage/not installer ready (according to Legacy Fabric discord channels):
Cursed Fabric Versions Known For Support:
For any information look to the Discord here: https://discord.gg/yBTpRXe but PLEASE don't ask for anything crazy (mods being backported or other types of requests).
My guess is to either just experiment or allow for people to develop for those versions, I don't really know otherwise. I mean Liteloader exists and its a lightweight modloader. I don't know the actual motivations with this so I can only assume.
I don't know how much developing for Fabric on older versions is compared to 1.14+ Fabric (and I only have a bit of experience with learning how to make mods for Fabric, I've never made one completely) but I'd say it's similar (or slightly different enough in comparison to Liteloader which uses similar but I think older aspects while Fabric's might be newer but adapting to the older versions, again I have no idea).
I don't think many mods on Forge will be ported to Legacy Fabric though (and definitely not straight away), I see mods with similar ideas and certain others like with current Fabric for the most part but nothing crazy big ported to it like people will expect, or at least not yet. It is still early and the first two mods are all I've seen, the rest is just still creating the modloaders for different versions so far so it's hard to say. I'd ask the devs themselves in the Discord for better answers as I'm just someone that is part of the Fabric community (a mod spotlighter) not a developer that knows enough about this stuff.
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Forum Thread Maintainer for APortingCore, Liteloader Download HUB, Asphodel Meadows, Fabric Project, Legacy Fabric/Cursed Fabric, Power API, Rift/Fabric/Forge 1.13 to 1.17.
Keep in mind that Legacy Fabric does not have many mods yet as the team is still making the framework of it, but for what I have tested the mods do work pretty well so far, so best to look at the mod list first to see if there is any of interest to you, but if you ok with testing it out that's fine, just don't expect it to be as good a replacement to Forge or Liteloader just yet.
For videos on how to install it/How the mods were a few mods ago when I took a look at them for the first time:
2.If you fine with where it installs just click create.If you need to redirect it because you installed the game in your documents for example then direct it there but the default is fine.
3.Then just got to your .minecraft folder (the easiest way is to go to the resource packs menu in-game of an unmodified version of the game, and select the left button in that menu).
4.This will make a window appear, taking you to the resource packs folder, go back up one to .minecraft and if you see a mods folder put your mods in there. If not then create one called 'mods' with no capitals.
5.Launch the launcher and if you see a Legacy Fabric profile then your good to go. If not go to the 'Installations' tab. And create a new profile. Go to the dropdown box and go up to 1.16 versions, the 1.8.9 Legacy Fabric version should be around the 1.16.2 range I think.