You can use the conversion package.
Online: - http://www.signbank.org/iswa_dev/convert
Download: - http://www.signbank.org/iswa_dev/convert.zip
There are 3 versions of BSW...
BSW 2008: - ISWA 2008 version of BSW
BSW 2010: - initial version of BSW for the ISWA 2010 ( May 11th, 2010)
BSW Revision 3: - final version of BSW for the ISWA 2010 ( June 22nd, 2010)
To use online, there are 2 pages.
The first converts BSW 2008 to BSW 2010:
The second converts BSW 2010 to BSW revision 3: