Hi Surajit,
I have Sketchup 7 Don't select Save for a file, Select Save As..A window will open asking you where you want to save the file, at the bottom there are two more windows - one for the file name and the lower is to select the file type. Click on the arrow to the left of this box and in the drop down window that opens select Sketchup 6 file format.
You can now import the saved file into 3dXchange.
I've also been able to open Sketchup files from ver 5 through 7 in Sketchup 7 without any problems.
Gerry
Gerry
System: Win 10 Pro (21H2), Asus X99-E WS, CPU i7-5930K -3,5 GHz, 32 GB DDR4 2666-16 RAM, NVidia GTX 1080 Ti GPU - 11 GB VRAM(Driver Studio-536.99), Samsung 850 Pro 512 GB SSD, 6 TB HD storage.