I recently decided to upgrade my MBP from Mountain Lion to El Capitan, having decided that there wasn't any particularly good reason to keep a version of ML. There are some slight differences/gotchas regarding searching for files which for me made Spotlight search rather less useful - or at least it was confusing - but I gave up on that anyway, and do file searching directly in Finder.
I wasn't sure how long it would take, or how big the install file would be. As I recall it took about an hour to download - though that will depend on the links used. Some people with very fast broadband might get it quicker than that, others may find it takes longer.
I wanted to capture the install file during the process. This is not completely obvious. After the download has completed a splash scren appears, with the word Continue on. This is the (perhaps only) opportunity to save the installer file. It may not be obvious in the Applications folder, but it can be found using Finder and the file should be called Install OS X El Capitan. It may also (perhaps) be found by scrolling down through all the applications in the Applications folder window where it might be seen at the bottom of the screen. It can be copied and a version put onto an external drive. It can also be copied and moved to a folder on the main drive. The file is around 6.22 GBytes, so actually it will fit on an 8GBytes USB flash stick. If it's allowed to run at this stage it will eventually remove itself. It's not a great idea to click on that at this stage if a copy is required, as that will start the install process.
When finally one does decide to do the install, then activate that file, and it can take about 20-30 minutes in a first stage install, after which the machine will shut down and restart. It may do that several more times. The overall process to a working system might be as long as an hour, and even then some more work might be needed. For example, the new (now running) system will probably rebuild all the mail, which may take a long while.
Having done this upgrade I now wonder whether it's worth moving one or more of my machines up to Sierra. I tried Sierra out recently in an Apple store, and managed to get several videos working simultaneously, including one in PiP (Picture in Picture) which is a feature not available in El Capitan. Perhaps oddly, the install file for Sierra is (I'm told) slightly smaller than for EL C - at around 5.7 GBytes.
Another concern I had on my MBP was how much spare space was needed in order to carry out the upgrade. Someone suggested that 20 Gbytes spare would probably work - so I copied files off temporarily, and indeed it does seem that 20 Gbytes spare is probably enough.
I wasn't sure how long it would take, or how big the install file would be. As I recall it took about an hour to download - though that will depend on the links used. Some people with very fast broadband might get it quicker than that, others may find it takes longer.
I wanted to capture the install file during the process. This is not completely obvious. After the download has completed a splash scren appears, with the word Continue on. This is the (perhaps only) opportunity to save the installer file. It may not be obvious in the Applications folder, but it can be found using Finder and the file should be called Install OS X El Capitan. It may also (perhaps) be found by scrolling down through all the applications in the Applications folder window where it might be seen at the bottom of the screen. It can be copied and a version put onto an external drive. It can also be copied and moved to a folder on the main drive. The file is around 6.22 GBytes, so actually it will fit on an 8GBytes USB flash stick. If it's allowed to run at this stage it will eventually remove itself. It's not a great idea to click on that at this stage if a copy is required, as that will start the install process.
When finally one does decide to do the install, then activate that file, and it can take about 20-30 minutes in a first stage install, after which the machine will shut down and restart. It may do that several more times. The overall process to a working system might be as long as an hour, and even then some more work might be needed. For example, the new (now running) system will probably rebuild all the mail, which may take a long while.
Having done this upgrade I now wonder whether it's worth moving one or more of my machines up to Sierra. I tried Sierra out recently in an Apple store, and managed to get several videos working simultaneously, including one in PiP (Picture in Picture) which is a feature not available in El Capitan. Perhaps oddly, the install file for Sierra is (I'm told) slightly smaller than for EL C - at around 5.7 GBytes.
Another concern I had on my MBP was how much spare space was needed in order to carry out the upgrade. Someone suggested that 20 Gbytes spare would probably work - so I copied files off temporarily, and indeed it does seem that 20 Gbytes spare is probably enough.
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