Upgrade ION Software from 1.3 to 1.7

My first attempt to upgrade the software on our ION console.  We are currently running 1.3.  Can I go directly to 1.7 or do I have to upgrade to 1.4 first?  

Thanks in advance for your help!!!!

Did I mention I'm a newbee on lighting controls???  BTW I love the ION training videos - they have been VERY helpful!!!

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