You may update Lightroom to the latest version from the following link : Keeping Lightroom Up-to-Date
Also if the Catalog is from the older version, you may go ahead and upgrade the Catalog to be compatible with Lightroom 6.
You may keep the latest version of Lightroom .
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Lightroom is now at 6.4.
When to upgrade the catalog LR 6 will make a copy that is compatible with the new application. The older version will remain in place.
Thanks Tanuj for your quick response.
Thanks DdeGannes for your help.
You are Welcome, Glad to help.