"Also, I didn't realise that CCC trial is from download, and now telling me it's expired... despite not even using it yet. "
(sigh)
One thinks you would have at least TRIED it during the trial period.
I'll offer a suggestion to make it usable again, and don't tell anyone I told you how to do this:
1. Download the free "App Cleaner"
2. Open your applications folder "in the finder".
3. Double click App Cleaner to open it (it's window will appear on the desktop)
4. Locate the icon for CCC and drag and drop it into App Cleaner
5. App Cleaner will "round up" all the CCC files and give you a button to move them to the trash
6. DO THIS. Then close App Cleaner and empty the trash.
7. Download a FRESH COPY of CCC.
8. Launch CCC -- does it work again?
Nice one, well you'd think huh? But the SSD was ballsed up in transit, and all my other externals are rammed, and needed a spare 500GB so waiting for the SSD... but thanks for this.
As your primary machine, I couldn't make a recommendation. Having quite a few macs here, I've upgraded the older machines at each new OS, tried them out for a few weeks, and then downgraded them back to either SL if possible, El Cap for those newer than the SL era. But those are our older systems that aren't in daily use. Some act as servers, some are just hooked up to run to a certain piece of equipment, and Snow Leopard & El Capitan run fast and steady on them. And of course SL looks great, so it's always a treat whenever you get to go over and use one of those systems for a few minutes, and are reminded of what Apples Ui team is actually capable of.
It does begin to resemble the idea that the machine as a whole runs best with its original operating system, but in this case that's coincidence, since most of our big computer orders happened in the SL & El Cap eras. Then again, I upgraded all our new Sierra systems to High Sierra, and that was such a total disaster, I downgraded them back to Sierra as well, and may stay there permanently if HS is never completed.
I think you've kind of proved my point, yes. Someone, anyone, tell me different and that HS is the best you can possibly get.....It's not like anyone hasn't ever commented that they've never matched the ease of SL, and we're now into the 7th year of trying. I don't doubt plenty are cool with it, but they're usually the late starters who never experienced SL.
Single points of failure are never good. I'd invest in a new/newer computer ASAP and keep the old as a backup.
In absolute terms I'd imagine Mountain Lion or Mavericks would be the best OS for 2011 hardware stuck with an HDD and 4GB ram, but since Apple has dropped ongoing support for both I doubt such an upgrade would be worth the risk for a business critical machine.
"Wow, Sierra is the best OS!" Granted, there is no way Sierra would actually productively run on 4GB Ram with an HDD, but it was the first OS where I chose to be an early adaptor and didn't regret it and is currently a stable final release. High Sierra has promise, but I think Sierra still wins due to support uncertainty surrounding APFS.
You are of course 100% correct, and I'm an idiot for not buying a new one. Business has been pretty pants, slowest it's been for years, and I probably should do an HP loan on a new MBP, Truth is, I'm not overly impressed with the new ones, and read many negatives, not just about the lack of ports, but plenty else besides, and also the rumour mill of a new model this coming summer? I doubt it will be that different, and pretty sure they won't upgrade a few more ports either, or bring back magsafe. Stupid little things that you wonder why and what goes through their mindset. But I know it's an obvious call to buy a new one after 7 years of usage. To be honest, it's quite impressive to me I've had it that long. Laptops I owned prior to being swayed over to Apple would never make it even half that long, so in answer to a previous shout, I wouldn't go anywhere else for my next laptop. I may even be able to go MacBook, but it's not that much cheaper than the Pro, and it's probably not enough for what I need either. I kind of like the option of being able to run two OS. I know that when I transfer an El Cap/Sierra into this one, there will be loads of things that won't work, or unexplained phenomenons it never did with SL. That's life, and very expected also. I'll have to also fork out for a compatible Word/Photoshop as that site, who's name I can't remember that shows what is and is not compatible says, no.
People I really appreciate your time on this post, and always am grateful that you guys take time out to answer my cluelessness. So thanks again for all input. I would LOVE to think it's helping others who are also rubbish at anything else, other than using the OS. And gives them ideas or help in these situations