If you are using VB4 16 bit then you already have the latest version of the JET 2.5 engine. Using only Access 2.0 would give you JET 2.0, which you could update to 2.5 with the Access Service Pack (ACCSVC.EXE available via ftp from Microsoft). However, because you have VB4 16 bit, you already have JET 2.5. If there is an update to the version that ships with VB4 I am unaware of it, although any VB4 users would be wise to get a hold of the VB 4.0a update (available very cheaply from Microsoft - call their sales department) which may have a slightly newer engine, but I have seen no documentation of such updates.

Hope that helps you out.