Disable Autosave Sketchup Free

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This issue has been acknowledged as a bug and they are working to fix it.

Sketchup Free Continuously Saving causing Lagging and Popup Message

We identified this bug and it occurs in rare circumstances. We will be patching it very soon. One workaround is to switch to another model (or a new model) temporarily and open the model again, which should avoid the bug. Sorry for the inconvenience and thanks for reporting it!