Found the following official statement on
http://www.adobe.com/products/livecycle/upgrade/ (under "Must SP2 be
installed before these various modules?"):"Workbench 9.5 is installed on
the developer desktop and will work with any ES2, whether ES, ES2 SP1 or
ES2 SP2, although 9.5 is suggested for use with SP2. Workbench 9.5 is
required for use with the three solution accelerators."But I'm
wondering, why don't you just install Workbench 9.5? It's quite easy and
noncritical.Hope this helps.Nico