Updating mac os 10 5 system requirements
Though it goes against Apple tradition, Apple has (thankfully) released 10.9 for free as long as you have the system requirements to run 10.8; a simple Google search will help you determine that.If you do, then download and install it onto your computer. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).
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.Again, if the hardware is compatible, you can jump to Mavericks to free (though unlikely for most 10.5 era hardware).Apple also sells Lion and Mountain Lion from the web store if you need an upgrade that isn't the latest and greatest.These system requirements apply to Crash Plan for Small Business (previously Crash Plan PRO).Code42 for Enterprise requirements are provided at Code42 platform System Requirements.The system does not allow to upgrade to any version higher than 10.6. From there, if the machine meets the requirements for 10.6 the process is to run the installer and replace / upgrade any peripherals and software that no longer work.
I'm not able to check it now, but I remember for sure that the computer was bought around 2009-2010, and it is one of these two (1, 2), which should mean that it can be upgraded even up to Maverick. You can use System Profiler to find to Model ID of your friend's i Mac (see this KB article) -- that'll tell you for sure which generation of i Mac you have, and whether it can run Mavericks (i Mac7,1 and later). From there, all upgrades come electronically from Apple.
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.
…do you mean that the i Mac was bought brand new (i.e., the newest model available in stores in the 2009-2010 time frame), or did you potentially buy an older model (i.e., from 2007-2008) in the 2009-2010 time frame?
Thus, you must have what Wikipedia calls an Aluminum i Mac [see 2nd link in your question].
If you are sure you bought it brand new in stores between 2009-2010, it was probably what Wikipedia calls the Early 2009 model.
Note Firefox 49.0 will require OSX 10.'''9''' at minimum to run.