Question in title. Help plz!
Sorry for the delay .. holydays.
-If you use the template, you can always click on File>New> and choose another template.
To delete the template, go to:
and delete the folder 'Z-Anatomy'
-If you use the Portable version, then it is a portable version, it works in parallel to the regular Blender and does not need to be installed; you can just delete the icon and the file; it won't affect the other versions that you may use.
In case of need, you can use several portable version, each one works independently.
I hope that it helps; if it does not answer your question, you can give me more informations about your OS, and version of 'Z-Anatomy' that you use.