One function of Trimble Connect (TC) that may have existed all along, but is new to me is the one I just tried: Down and Up converting .skp files!
I used my newly installed 2019 SketchUp (Classic or Pro - you say tomato) and created a simple file, then published it to TC from within SketchUp.
Next, I opened up my (still installed) 2018 Pro and, using the Trimble Connect option in the File menu, opened that file. NO warning that I needed a later version of SketchUp, it just opened. So I saved it with the same file name locally - prepended with “2018 -”, and also published it to TC under the new name.
The one thing I haven’t (yet) tried is publishing to TC from 2018, then trying to load it through TC in 2019. So I’m about to try it …
No problems opening 2018, creating a small test model, saving it locally, then publishing it to Trimble Connect. But …
I can open 2019 just fine. When I try to select “File–>Trimble Connect --> Open Model …”, the Open Model window opens on the Projects tab, but it’s now been 3 minutes of the spinning wheel of death and the projects still aren’t populated! Same symptom if I try to “Publish” instead of “Open Model …”.
But THAT seems to go away with a restart of SketchUp 2019 - and I was successful in loading the “saved as 2018” file through TC - without the “This file was created in an older version” warning. I saved it locally, then tried opening in SU 2018 … and got the “created in newer vision” message. Exactly as I expected.
So, except for some problems likely local to me, it appears that TC can, when any file format is uploaded, let people download it from within any version of locally installed SketchUp, even when it’s an earlier or later version of SketchUp, without any errors or warnings.