Download DEMO 32-bit version of RES2DINV and RES3DINV from Geotomo Software website . You can also order a USB flash-drive from us with all Geotomo materials for a nominal fee + shipping and handling Note, that you can use RES2DINV without RES3DINV, but not the other way around - RES2DINV have to be installed first. This demo software has decreased functionality, but it might be enough for your research and the DEMO versions never expire. However, if you decide