Hi.I have registered only to download some blocks from the Catalog (and to upload some in exchange). But once I am logged in, let me ask a question.Some blocks you offer are in a format that my AutoCAD (2006) cannot read. What tool do you recommend to convert these newer DWG files to an older format?Thanks, Elsa

Thanks for the uploaded blocks, Elsa.
 
The most reliable conversion tool (makes genuine RealDWGs) is the free utility Autodesk TrueView 2008 - see:
http://www.cadforum.cz/cadforum_en/qaID.asp?tip=4706
 
It can convert DWG files (up to DWG2008) to older formats (down to DWG R14).
 
Regards