There is no trial version available now to download
But you can still download the trial version of office 365 home or personal edition. Atleast it will work for one month and you can use Word, Excel, PowerPoint, OneNote, Outlook, Publisher, Access https://products.office.com/en-us/try
Note : If you are student of University of Kentucky you can download the software edition free. To do so you have to enter your Student ID and temporary passcode which is provided by University. After logging in you can opt for free Version of this software.
Other methods
I you ask me i would have definitely chose OpenOffice or LibreOffice instead of all this hassle,though there is a catch. Both of these open source software’s are weak on the point of running macros. So if you are planning to do something more simple it is one of the best option available.It can save,open and edit documents in every format.
Though there is no excel 2007 version available for Apple Mac pc’s but still if you really want to run it then here are two options. Trying it VIA Boot Camp Assistant and the other one is using the virtual Machine to run Windows.
Note : MS Excel Macros don’t work on parallel virtual machine, to use them you have to copy the Microsoft Excel file directly to your Windows virtual machine HD.
Boot Camp Assistant will parition your HD and install windows on it, so actually it is like installing another OS on same pc. If you are ready to do so follow the steps.
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Note: You can use Dropbox,skydrive and install it on the main Os that the MAC one and swap files between both of the systems easily.
Download https://www.apple.com/in/support/bootcamp/
https://www.apple.com/support/bootcamp/getstarted/
After installation restart your pc and select windows on startup .
How to do it with Virtual Box
Here is a complete guide on how to install and run windows within mac .
http://dashes.com/anil/2009/10/how-to-run-windows-7-under-mac-os-x-106-for-free.html
If you find it typical to understand try this video tutorial
Thinking of purchasing it ? Wait please have a look at what are the differences in Excel 2011 available for MAC and windows.