For models acquired outside cgtrader?
Cgtrader does not or as far as I know it does not but you may find someone on the forums willing to help you if you make it worth their while.
How many models do you need converted? How much money are you willing to spend per model. Based on that I am quite sure that many artists will show up on the forum to help you.
Cool! If you want I can try doing it for you. I can try importing it into Blender and converting it. What kind of data do you loose? What do you want your file to convert into? OBJ, STL? If you need to convert it and keep rig information etc... usually you can install a plugin in maya called FBX that solves the problem but even then rig, dynamics data tends to malfunction when converted over to programs like lightwave, 3ds.
One thing you could try right off the bat is make sure you always save the files you make in M.A format instead of mb. M.A files are more reliable and also if you get stuck you can get some genius who reads code to fix stuff by opening the code in a text file.
Just remembered another thing. Should this happen to you again you can also ask the modeler where he stores the texture data on his computer. Once you know that then all you need to do is create a folder in that same location named in the same way and drag and drop the textures there. That way you won't have to do anything in the maya file and maya will automatically find the textures. I hope this helps. Please let me know if you are able to resolve all the issues.
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