Blender is free to use
https://www.blender.org it doesn't cost a penny, I'm not sure which version you need as I know there is a version that works better with GG, sorry I can't help with Sketchup.
PC - Windows 7 64bit, Intel i5, 12Gb Ram, 1TB WD Black, Evga Geforce 760gtx 2GB
Laptop - Windows 8.1 64 Bit, Core i7-3632QM processor, 8GB of RAM, 1Tb Hdd, Nvidia Geforce GT 740m