Convert .max to .obj?

You need 3ds Max program for that. You'd better ask seller if he can export needed format for you or ask cgtrader - they claim to provide free model conversion service for buyers.

ask seller to convert the file

thanks

I'm sure I found a small app that allowed that at one time... *looks*
Aha!
Here it is
https://spin3dconvertersoftwarefree.en.softonic.com/

Oh, I guess it doesn't convert max :|

I could have sworn...