I see a DBD-ODBC-1.06.zip at ActiveState's ZIP files for 5.8 directory.   What exactly (and where from) did you download as DBD-ODBC.zip ?

And I'm confused on another point?   Why did you need to download anything manually?   You should have been able to say "ppm install DBD-ODBC" and PPM would have gone to the ActiveState site and grabbed the latest and installed it.   Is there some reason you are trying to install from ZIP files?