Exactly like you said. I have both versions 2013 and 8.
Because version 8 becomes default so doubleclicking on a file to open was giving errors about version.
I didn't realize that I had 2 vesions installed 
Thanks for help, problem solved 
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Latest posts made by simonq
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RE: Update problem
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Update problem
Hi,
I've just did upgrade via Sketchup -> Check Web for Upgrade and now I can't open files anymore.
It says File was created with version 13.0.3688 and you have 8.0.16845 ....
So I upgraded from version 13 to 8 ??? How it's possible? How they allow to acctualy downgrade the app?
I didn't realize that there are versions above 8...Do you guys have any solution?
Regards,
Michel