This link gives you info about how to determine the levelof Jet 4.0
>>>> By-default JET will not be included into your installation and Jet is
>>>> part of MDAC starting MDAC 2.6. You would need to include it separately
>>>> install it separately. Jet installation comes separately and you could
>>>> download latest version of it from the next link, but when you check it,
>>>> will see that Jet installation is Windows-specific. It add some
>>>> to the distribution of the application, since, depending on the version
>>>> Windows installed on client's PC, you would need to use different
>>>> installation of Jet. In this case I would suggest not to include Jet
>>>> your package and install it separately or notify client they need to
>>>> Jet separately themselves
>> Thank you very much, I just have had the files downloaded (for every
>> paltform I need).
>> Yet I would like to make sure - this SP8 is a full installation and does
>> need any previous versions, yes?
>> Because I thought I read somewhere that this is just an upgrade and
>> that Jet 4.0 is already installed,
>> but looking again - I can see it should be fine even if there is no
>> installation of office or so.
>> Then, may I ask yet another question - is there a way to check (during the
>> installation) if Jet 4.0 is already installed
>> (in other words where to look for it?)
>> Thank you very much for your help!