Check your account page to see that the trial has been added to your account. There is also a hyperlink below the table to "Get a Trial". You could try that.
If the free trial is appearing in the table, use the down arrow on the right of the product description to download your trial.
If you cannot download the trial, or are having difficulty still, contact customer support.
When you log in to your account and go to the Download Installer page, under Downloads, you should be able to see these two choices: 1) Download R2016b 2) Download Earlier Release The latter would allow you to choose whichever earlier release you want.
If you are using an Academic or Professional license, and you are the license contact or technical contact, and if you have a support agreement, then you can go in through the MATLAB Central License Center to download any version they still have posted.
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