A friend of mine has a desktop Apple computer (I googled Apple computer images and it looks like an i Mac). When we tried to upgrade it the OS reported that there are no updates available.
We googled around to find alternative ways of upgrading the system - 3-4 different clicking paths all leading to the same system update program - but with same outcome.
The name Sierra continues on with their California landmark theme, in this operating system the use of the term ‘OSX’ has now dropped the ‘X’ to ‘OS’.
Disappointedly for some the new mac OS will run on less machines than its predecessors including OSX 10.11 El Capitan.
Apple also sells Lion and Mountain Lion from the web store if you need an upgrade that isn't the latest and greatest.
Your first practical step is to go to and find in support the article on indentifying your Mac to determine the hardware capabilities before spending any time or money on incompatible upgrades.
Text Wrangler is freeware and does not require activation with a product serial number.
This version is recommended for all Text Wrangler customers whose Macs meet the specified system requirements.
(Read More) Likewise, if you are updating an existing Text Wrangler installation, we recommend that you switch to BBEdit. Release Date: 09/20/2016 – This disk image contains the Text Wrangler 5.5.2 application, which can be used to replace any prior version of Text Wrangler.
Next, ensure your system is not experiencing any major problems, which include regular freezes or crashes of applications or the entire system, or the inability to log in to a user account, enable sharing services, or establish hardware connections to peripheral devices or networks.
Sometimes these can indicate hardware problems, but otherwise may suggest software configuration errors that may migrate with the system during the upgrade.
Beginning March 23rd, 2015, the Dropbox desktop client will no longer be available for download on OS X Tiger 10.4 or OS X Leopard 10.5.
If you are currently running the Dropbox desktop client on these versions of OS X, you will no longer be able to sign in to your existing account or create a new account through the desktop client.