Hello Rosemary and welcome to the forums!
The steps that you had previously described (choose version, language, operation system, and browser download) are those needed to initiate the download process from within the Education Community. Where you able to download the software by clicking on the browser download button?
Once downloaded, opening the .dmg (Mac) will start the installation process at which point you will either be able to input the licensing information of install as a trial.
Please let us know if you have any additional questions!
In this instance you will need an activation code to manually override the system, of which I'd be happy to generate for you. Please send me a Private Message (click on my philip.s profile name and then "Send this user a private message") with the corresponding request code and serial number.
Please note that for future reference you can also receive an activation code directly from our Registration and Activation team by clicking here.