DAE models keep messing up

[Aquatically404]

I have several models I want to upload to the models resource but i have a problem
I wish i could upload a screenshot but it's too big to upload
Whenever I try to export a DAE in blender, the bones mess up and become one star in the middle.
The model also becomes gigantic
I have a fix for DAE model exports as a script but I don't know how to install it
  collada-exporter-master.zip (Size: 28.78 KB / Downloads: 60)

If anyone can tell me how to install the addon or what I need to do to properly export DAE models it would mean a lot