Upgrading From 2.2.5 To 3.0.6


I have installed v3.0.6 in subfolder on my server. I have my current 2.2.5 version in the root directory of the same server. I tried to run Store Import - I entered the full path,it validated, and it showed me the correct database info in the Expert Settings.I clicked Import, and I got an error “Import from this version is not supported”. Why would this be? I see in these forums that many people have imported from 2.25 to 3.06 successfully using the store import.