The free upgrade to Windows 10 offer from Microsoft expired on the 29th July, 2016.
But Microsoft has a number of exceptions in place for users that missed out on the free upgrade and they have currently not stated any end date to these exceptions (except for Assistive Technologies which has ended), but will adjust as necessary.
You will have to contact MS support and they may be able to assist you with a free upgrade to 10..
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But first make sure that you have the correct system requirements and that your Computer Manufacturer supplies the correct Drivers for 10.