kobo database version unsupported error on MAC 10.6.8

I'm running MAC OS 10.6.8 with Calibre 1.48

Today I plugged my Kobo Aura in after the firmware was updated to 3.8.0 and I get a popup with the error below.
I really don't want to update my MAC OS as everything runs fine right now and I've read of so many problems with upgrades breaking things. Is this a case off having to upgrade my MAC because this issue will is resolved in a later Calibre release?

calibre, version 1.48.0
WARNING: Failed: Kobo database version unsupported - See details

Your Kobo is running an updated firmware/database version. As calibre does not know about this updated firmware, database editing is disabled, to prevent corruption. You can still send books to your Kobo with calibre, but deleting books and managing collections is disabled. If you are willing to experiment and know how to reset your Kobo to Factory defaults, you can override this check by right clicking the device icon in calibre and selecting "Configure this device" and then the "Attempt to support newer firmware" option. Doing so may require you to perform a factory reset of your Kobo.
Device database version: 104.
Device firmware version: (3, 8, 0)