Step 4.1 - This appears to work
To activate, when Dr Scheme loads up, select Language > PLT > Graphical
Then open as.scm (yes, there are two files, but the one you want is the one with that is 4KB)
Step 3: install MzScheme 352 (and realize that none of the environmental variables are set and that the first todo will be to set up a single package install that does both)