Available versions are listed below.
If you have a 64-bit version of Excel installed, then you need to download the 64-bit version of What'sBest. If you have a 32-bit version of Excel installed, then you need to download the 32-bit version of What'sBest.
Before installing What'sBest we recommend you confirm whether you are running a 32 or 64-bit version of Excel. The majority of Excel users are running a 32-bit version of Excel on a 64-bit version of Windows.
From Excel 2013 or newer, select File|Account|About Excel. From Excel 2010, select File|Help. The information displayed will confirm whether the 32 or 64-bit version of Excel is installed.

Beta Release:

What'sBest!
Version
Operating
System
Microsoft® Excel® File SizeDownload
15.0 (32 Bit) Windows Excel 365, 2016, 2013, 2010, 2007 and 2003. 55.2 MB
15.0 (64 Bit) Windows Excel 365, 2016, 2013, and 2010 -64 Bit. 63.5 MB

Current Release:

What'sBest!
Version
Operating
System
Microsoft® Excel® File SizeDownload
14.0 (32 Bit) Windows Excel 365, 2016, 2013, 2010, 2007 and 2003. 48.3 MB
14.0 (64 Bit) Windows Excel 365, 2016, 2013, and 2010 -64 Bit. 55.2 MB

Older Releases:

What'sBest!
Version
Operating
System
Microsoft® Excel® File SizeDownload
13.0 (32 Bit) Windows Excel 2013, 2010, 2007 and 2003. 46.4 MB
13.0 (64 Bit) Windows Excel 2013, and 2010 -64 Bit. 51.7 MB
12.0 (32 Bit) Windows Excel 2013, 2010, 2007 and 2003. 46.4 MB
12.0 (64 Bit) Windows Excel 2013, and 2010 -64 Bit. 51.7 MB
11.1 (32 Bit) Windows Excel 2010, 2007 and 2003. 36.7 MB
11.1 (64 Bit) Windows Excel 2010 -64 Bit. 40.5 MB

Note: What'sBest! 32 or 64-bit format will depend on Excel, not Windows.