I don't think any of the Wizardry games are shareware/freeware yet.
You want the Ultimate Wizardry Archives which includes Wiz 1 through 7 and WizGold as well.
You can buy it online at some places such as
http://www.cdaccess.com/ (comes with box)
http://www.chipsbits.com/ (jewel case only)
There are lots of them on various auction sites such as ebay as well.