First go to github to download MixamoConvert, download the zip package directly, no need to decompress
it. The blender version I used this time is 2.92, which can be adapted to the plug-in.
Open blender, select Edit-Preferences-Plugin-Install, 
select the zip package
and then check it Plugins
On the right, you can see the option bar, see mixamo
Open the advanced options, check Use Unreal Engine Bone names,
the two paths are the input model and the model to be output to, click Batch Convert to perform batch processing
