Yes.
It's end-of-life for 6.4.all-of-them. You need to go to 7.anything to retain support.
Ah, beaten by Petar
My answer was shorter . Just to add some info - the Atlassian support policy is two years since the first release of a particular minor (e.g. 6.x) version - 6.4.0 was released in March 2015.
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