Solving the Optifine installation issue in MultiMC without Forge version

This article mainly addresses the mounting issue of Optifine without Forge (e.g., version 1.13).

In the stable version (updated through stable), you can use the mounting method provided in the official wiki. However, in the testing version, due to code changes, the placement path of Optifine's jar file needs to be modified.

https://github.com/MultiMC/MultiMC5/wiki/MultiMC-and-OptiFine

Create a new instance in MultiMC.
Click on Edit Instance to open the instance page.
Click on Add Empty.
Set uid to optifine.OptiFine and name it as OptiFine.
Select the newly created component and click on Edit to open the file in a text editor.
Edit the JSON (an example is provided below).
Download OptiFine and save the jar file to <Instance /libraries/.
If the folder doesn't exist, create it.
<Instance refers to your instance name (e.g., Baka943/libraries/).
If you look at the entire path, it should be like this:
.../MultiMC/instances/<Instance /libraries/OptiFine_1.13_HD_U_E3_beta4.jar (this is an example filename)
- Launch the instance from MultiMC.
  If this example doesn't match your OptiFine version exactly, modify the version.
  For example, replace all occurrences of 1.7.10_HD_U_E3 with 1.7.10_HD_U_F1.
  You can check if there are any errors in the file by clicking the Reload button on the version page (the edit instance page opened earlier), and any errors will be immediately displayed on the page.
  Example provided by the author:

{
    "formatVersion": 1,
    "+libraries": [
        {
            "name": "net.minecraft:launchwrapper:1.12"
        },
        {
            "name": "optifine:OptiFine:1.13.2_HD_U_E4",
            "MMC-hint": "local",
            "MMC-filename": "OptiFine_1.13.2_HD_U_E4.jar"
        }
    ],
    "+tweakers": [ "optifine.OptiFineTweaker" ],
    "fileId": "optifine.OptiFine",
    "mainClass": "net.minecraft.launchwrapper.Launch",
    "requires": [
        {
            "uid": "net.minecraft",
            "equals": "1.13.2"
        }
    ],
    "name": "OptiFine",
    "version": "1.13.2_HD_U_E4"
}