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Thanks guys, some great advice so far. On balance at the moment I'm thinking its probably worth doing the upgrade.

Sounds like an idea but I wouldn't know where to start to fit it!

What kind of extensions are they?

Thanks for those comments. Much appreciated.

Sorry if this has been asked before, but I keep getting pop-ups asking if I want to upgrade my Mac to OS Mojave. Tried Google but seem to be conflicting ideas.

So is there anyone among us who...