Trying to update old add-on for 3.4 and failing. Plz help

Coding Python Support
2

Looks like you need to fix some syntax:

filepath =  StringProperty(
    name = "File Path",
    description = "Export path",
    maxlen = 1024,
    default = "" )

should use colon.

filepath: StringProperty(
    name = "File Path",
    description = "Export path",
    maxlen = 1024,
    default = "" )

as such i don’t think class ExportMD5Cam is actually being registered i think that was a blender 2.8 change.
Reference/Release Notes/2.80/Python API/Addons - Blender Developer Wiki

Also need to check your matrix operations

Reference/Release Notes/2.80/Python API - Blender Developer Wiki