I received the following request from a customer.
I need to update my computer from a 10.9.5 to a minimum of a 10.10, how can I do that without losing my files?
This individual had a Macbook Professional with Mavericks installed. They were trying to connect a new printer, a Canon TS5100. This install would not get past the set up stage, after loading the Canon installation CD-ROM.
Canon recommended upgrading MAC OS 10.9.5 Mavericks to at least MAC OS X 10.10 Yosemite. Below is my response with some instructions. Usually, upgrading your MAC OS does not affect your personal files. However, you can back your data manually to an external hard drive or USB flash drive.
Also, you can create a Time Machine backup of your computer. You can upgrade your Macintosh with operating system 10.9.5 Mavericks by going into the Apple Store. You will need to download Yosemite.
Once that download finishes, you will be prompted to install or need to double click the download. You will need your Apple ID to enter the Apple store. Also, you will need your Macintosh administrator password.
Without either password, you will be fucked. You may have to upgrade to MAC OS 10.11 El Capitan or MAC OS 10.13 High Sierra instead. You will follow the same steps.
Once you enter in your correct Macintosh administrator password, you will continue on with the prompts. You will choose the destination hard drive. Finally, you will click on “Restart”.
Your Macintosh will reboot and upgrade from MAC OS 10.9.5 to MAC OS X 10.10. Congratulations, you have upgraded the operating system on your Macintosh. If you are having problems finding OS 10.10 Yosemite, there is a search tool within the Apple Store, in the upper right hand corner.
Type in MAC OS Yosemite or MAC OS 10.10 and hit your enter key. If you cannot find a download for Yosemite, then search for El Capitan 10.11 or High Sierra 10.13 instead. Once you successfully upgrade your Macintosh to a newer operating system, then you will be able to reinstall that operating system upgrade via the Apple Store.
Click on “Purchases” tab in Apple Store and any operating system you downloaded and installed should be listed. You would just click on “Download” and follow the prompts to install that Macintosh operating system.