Navision 4.0 Latest Service pack

Hi,

Can anybody tell me what is the latest service pack for Navision4.0 and also please tell me from where I can download it.

I do have a Partner source login. When I tried to download last time, it downloaded the entire NAV application itself along with SP3. It is bundled together.

My requirement is I do have a customer who already has NAV 4.0 with Service pack1 on it. Now they are planning to update this installation with latest service pack.

Can anybody tell me how can I downlod the Service pack alone

Thanks

Thomas Philipose

if you download and install sp3 and connect to sp1 data base it will asks you to upgrade say yes it will upgrade.but this cannot be reverted