Getting a Python error in my PSK import script

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Yesterday I downloaded this PSK import script. I put it into my scripts folder and opened Blender, and when I selected the psk import on my import menu, it gave me this error message:

File “<string>”, line 1, in <module>
File “C:\Users\Kitty\AppData\Roaming\Blender Foundation\Blender.blender\scripts\import_scene_unreal_psk.py”, line 584
return {‘FINISHED’}
^
SyntaxError: invalid syntax

I am not a programmer, I do not know how to deal with this. Can this be fixed or do I need to search for a different import script?