Hello Joe
Please use CodeWarrior v5.1 for HC(S)12 for your MCU development, it can be downloaded from website.
1) Please log on NXP Website (www.nxp.com) with email address and password.
2) Under <SECURE APPLICATIONS>, Click on <Software Licensing and support>, page appears showing your currently licensed products.
3) In ‘Product List’ page, select your CodeWarrior Suite. Then under its ‘Previous’ tab, find the CodeWarrior for HC12 v5.1.
Best Regards
Fiona Kuang
Technical Information & Commercial Support