>We're also using DynaZip, but I was not aware of a new version. Do they send information about updates to all customers, who purchased thir software?

We own 3.0. We received no notice from Inner Media about version 4. I may not have filled out the registration card or whatever. When I emailed them to ask for a summary of improvements or bug fixes (to justify an upgrade purchase to the managers), I received no reply. Therefore, we have not upgraded.
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>BTW, I'm using Mark Mccasaland class for DynaZip (sort of wrapper), which made my life much easier...

How did it help? I know, I should look at it myself....