If for some reason you don't know which version is your Mac computer, then go to You can see that it is a Late 2008 model and, based on the How to Upgrade guide, it is compatible with El Capitan. An upgrade to the RAM and the HDD to Solid State Drive would be highly recommended.
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.
Crash Plan for Home requirements are available on our Crash Plan for Home support site.
The newest version you can run on a Intel Mac with OSX 10.5 is Firefox 16.0.2 which you appear to have?
Even if all of the previous deductions were incorrect, as long as you are 100% certain that the i Mac has an aluminum housing (i.e., the outside is gray, and not white), then even in the worst-case scenario in which your i Mac is from Mid 2007, you are guaranteed to be able to install OS X 9 (Mavericks).
https://support.mozilla.org/en-US/kb/firefox-osx https://support.mozilla.org/en-US/kb/firefox-no-longer-works-mac-os-x-10-5 Firefox 17.0 to the current 48.0 has required OSX 10.'''6''' at minimum to run.
Operating System Internet connection: At minimum, you'll need 56 Kbps to e-file and download program updates. Monitor resolution: 1024×768 minimum Mac-compatible inkjet or laser printer if you want to print your tax return or any tax forms.
We no longer sell or support Turbo Tax for 2012 or earlier tax years.
Here are the minimum system requirements for Turbo Tax 2013 through 2016 software for Mac Basic, Deluxe, Premier, and Home & Business editions.
Note that after the 2016 tax year, Mac OS X v10.9 and v10.10 will no longer be supported.