Be sure that Minitab knows where to find your downloaded macro. Choose . Under Macro location browse to the location where you save macro files.
If you use an older web browser, when you click the Download button, the file may open in Quicktime, which shares the .mac file extension with Minitab macros. To save the macro, right-click the Download button and choose Save target as.
To run the macro, choose and type:
%RTP
Click Run.
This macro utilizes the following columns, constants, and matrices for "scratch" storage. Be sure these locations are empty, or edit the code to specify different storage locations.
Reference
D.W. Marquardt & R.D. Snee, "Ridge Regression in Practice" The American Statistician, VOL. 29, NO. 1.