Macula

Macula is a shaders mod for Minecraft Beta 1.7.3 Fabric fork named Babric.

To install it you simply need to get the Babric instance, install it in your launcher of choice, and use Macula as a usual Fabric mod.

Modern shaderpacks will almost 100% not work or will look extremely broken. But you can find some old ones in the legacy Minecraft Discord servers, such as Mango pack - https://discord.gg/y8xyzvZnjS