I havent heard of any issues but make sure you go to 15.2.1 not 15.2.0 as you will need to change all user passwords if you use 15.2.0.
I would still raise a ticket with support before you upgrade from 14, just to check there is no specific upgrade path. You could also try it on a test server with a trial before you do it on your production server.
Any chance you have a copy of version 14 File Server only?
We're running an older version (12) and are licensed for 14.
I raised a support case late last year as part of a migration process and was told they didnt have a copy of ver 14 for me?
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