Need help updating a skectup model

Hello, please excuse me for my bad english, I use a translator.

My problem is that i whant update a sketchup model with Sketchfab Uploader but I can’t do it because I lost the original file, and I can’t find it.
The modele i whant update on sketchfab : Force aérienne Marley aéronef / Marley airship - Download Free 3D model by RedC130 (@RedC130) [8535378] - Sketchfab

Do you have any solutions for me?
Thanks

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