You can target your users on the current app version using the App Version attribute.
Assuming your latest App Version is 3.9, you would need to do the following:
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Go to the "Segment" page from the sidebar
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On the Create Segment tab, select the filter for User Behavior.
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Select the condition “Has Executed” and the event “App/Site Opened.”
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Enter a duration using the drop-down options and text box.
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Enter a time period using the drop-down options and text box.
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Click “+ Attribute.”
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Select “App Version” as the Filter By Attribute.
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Enter a version number using the drop-down options and text box.
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Click “+ Create” to save the query as a custom segment or begin campaign creation.