INSTALLER-DocBook 1.67 XSL Stylesheets

I noticed that the XSL 1.67 stylesheet tar.gz file contains an 
INSTALLER.  I did not see a similar INSTALLER in version 1.66.1.  Is it 
necessary to run the INSTALLER if I access the stylesheets as follows ?

java org.apache.fop.apps.Fop -xml Test.xml  -xsl 
~/software/docbook-xsl-1.66.1/fo/docbook.xsl -pdf Test.pdf

java com.icl.saxon.StyleSheet -o test.html test.xml 
~/software/docbook-xsl-1.66.1/html/docbook.xsl use.extensions=1

Cheers,

Tristan
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Tristan J. Fiedler
Postdoctoral Fellow - Stein Lab
Cold Spring Harbor Laboratory