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Where could I get any version of Navision DOS? it's very interesting software.

The version it's quite old ......
I only know one company that still uses it. If you want that version you must ask directly to MS.

I am quite sure Microsoft won't be so kind to give me Navision for free. Any suggestions about where should I ask?

Isn't free. You must have a valid license to run it.

And if I have a license file, I can get Navision?
What a bout demo license.
P.S.
Actually I have found Dos demo but it's in Danish. So I can't do anything. can I translate .STX file?

By yourself? No.

I have one question, I do you want to implement and outdated software ?

I need an OLD Navision but at least in English and this is not for commercial purpose.

Since Financials 1.3 you get an Evaluation Licence ("Cronus"). But the DOS-Version never had such a licence File. So you need to contact an owner of 3.56, and take a look there.

By the Way: Even if you can not integrade OCX, or user Copy and Paste or an Mouse, Navi 3.x still beats some actual ERP on the marked, and is fast and easy modificable, even faster (but with more limitaitons) than Navision FinancialsAttainDynamicsNAVSAPgreatPLains......

You can download the Navision DOS version 3.56 here. But please remark that it's only a demo version.
I guess the best way, if possible is that you find a company that have a Navision license today, but isn't using it and then ask them to donate it to you. I have heard that Navision previously have accepted such donations to non-profit organizations (normally you need to be a 50% owned subsidiary if they should accept such a transfer), but I don't know about Microsoft today.