Errors in Developers toolkit

I need a help. Is there any way in which we can use the Developers tool kit’s compare and merge tool to upgrade NAV 4 to NAV 5. cos the latest version of the developers tool kit cannot access the Navision 5 Database. And i get an error message when i try to run the Developers tool kit with the 5 version. can you give me a solution to this

Database used in developer’s toolkit should be in 4.0 SP3. You can import objects to compare from a 5.0 to use in toolkit on a 4.0 SP3.