Yes, it is enough to install the latest hotfix.
There is an AC 10 Library Subset for AC11:
http://www.graphisoft.com/support/archicad/downloads/goodies11/ITA.html
There is also info about Library Subsets:
http://archicadwiki.com/Library_Subset
There is also AC9 Library Subset for AC10 on this page, but only in US version:
http://tr.graphisoftus.com/welcome-LibArchives.asp
If anyone know where to find the INT version, please post it.
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