I'm trying to bring in props from Sketchup to iClone 7. The oldest Sketchup file format available for download for my prop is 2017, but 3DXchange7 is saying 2015 or older is the only supported files in skp format. Any idea why 3DXchange7 is not updated for newer skp files? Or is SketchUp no longer supported? Thanks.

pCon Planner to the rescue! :)
https://kb.reallusion.com/Product/52850/How-To-Import-Files-From-3D-Warehouse-Into-3DXchange?kbkeyword=skp

pCon Planner to the rescue! :)

Thank you for this solution. I appreciate it.

You can also still download Sketchup 2017, which is the last desktop version (https://help.sketchup.com/en/downloading-older-versions).

https://www.sketchup.com/sketchup/2017/en/sketchupmake-2017-2-2555-90782-en-x64-exe.

It supports saving as Sketchup 2015 or earlier.

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76% of original size (was 661x19) - Click to enlarge

Sounds good, thank you.