You'll need to do a lot of work to do this.
First, all the configuration will have to be done by hand - you'll need to recreate all the schemes and their content in the target JIRA.
Second, you'll need to export the data from 6.2. Then downgrade it to 5.2 in a test system, then export it from test and you can use "project import" to import it from there.
There is nothing that handles a downgrade of JIRA data though, so you're really going to struggle.
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