Before using the BP Formula add-in, it's important to check your Excel version and ensure that you're using the correct architecture version, which is either 32 bits or 64 bits.
The add-in is installed by default in the directory C:\Program Files (x86)\bookprogress.com\BP Formula, and includes two files: BP Formula.xll and BP Formula 64.xll.
If you accidentally open the BP Formula 64.xll file while your Excel architecture is 32 bits, a dialog box will appear.
In this case, simply close that dialog box and open the other file, BP Formula.xll, which is the correct one for your Excel version.
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