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Can it be installed over current version or must you remove old version before installing 4.0

As a general rule of thumb, if it's a case of moving up to a newer version (i.e. v2.0 to 3.0; or v3.7 to 4.0), I always uninstall the old version first. If it's just a small version update (i.e. v3.7 to v3.8), it's safe to just install over the top of the existing. There can be exceptions to this of course depending on the specific software in question, but that doesn't happen to too often.