can not execute

i could not execute this app on 10.6.8.

Dyld Error Message:
Library not loaded: /usr/lib/libcurl.4.dylib
Referenced from: /Applications/Bookpedia.app/Contents/MacOS/../Frameworks/Pediabase.framework/Versions/A/Pediabase
Reason: Incompatible library version: Pediabase requires version 7.0.0 or later, but libcurl.4.dylib provides version 6.0.0

akenox about Bookpedia, v5.4