Do the changes in the 6.3.2 version of the scripts (Additional Fields XML namespace) require updating custom XSLT?
All functionality from the stock XSL (like Result, Title, Url, etc) remains unchanged, so if you've just made cosmetic changes then you don't need to update.
If you've added XSL to access any Additional Fields that you've defined in your profile, then there are two small changes that will be necessary.
* the Additional Fields namespace needs to be declared at the top of your XSL file if it's not already, like this:
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:u="http://www.thunderstone.com/ws/ThunderstoneSearch/1.0/">
* any place where you reference your additional field, you need to use the prefix from the previous declaration (in this case, 'u').
so this
<xsl:value-of select="myField"/>
becomes this
<xsl:value-of select="u:myField"/>