Below are the instructions for totally removing SPC for Excel from a PC or Mac. If you just want to remove it as an add-in, please see this link.
The video below is for the PC only and covers both removing SPC for Excel as an add-in and removing it completely from your PC.
For PC:
Close Excel.
If you don't know the location of the software, search the computer for "spcforexcelv6" (this is the software program file). Note the location.
Browse to the folder and delete the software program file.
Open Excel.
You will get a message that the file "spcforexcelv6.xlam" cannot be found. Select OK.
Select File
Select Options
Select Add-in
Select "Go" by Mange Add-ins
Uncheck "spcforexcelv6.xlam"
You will get a message asking if you want to remove it from the list. Select Yes.
Select OK.
For Mac:
Select Tools on the Excel menu.
Select Add-ins.
Uncheck "spcforexcelv6.xlam"
You will get a message asking if you want to remove it from the list. Select Yes.
Select OK.