Hello,
Welcome to Microsoft Community and thank you for posting your query.
Let me assist you with Office issue.
1) Did you check for the confirmation email in Outlook Junk folder?
2) What is the default browser in use?
Make sure you sign out of all the Microsoft Services on your default browser including Mail, Calendar, MSN or other Microsoft sites etc. (to which you have logged in).
You may delete all the browsing history, cache and the temp files from the browser and check if you are able to download Office 365.
You may use Internet Explorer to download Office 365 and check if you are able to download and install Office on the computer.
If the issue persist in Internet explorer, you may reset IE settings using the link below and check if you are able to download and install Office on the computer.
http://support.microsoft.com/kb/923737
Disclaimer: The Reset Internet Explorer Settings feature might reset security settings or privacy settings that you added to the list of Trusted Sites. The Reset Internet Explorer
Settings feature might also reset parental control settings. We recommend that you note these sites before you use the Reset Internet Explorer Settings feature.
You may also refer to the general troubleshooting steps mentioned in the article below while installing Office 2013/ Office 365 and verify the status.
http://support.microsoft.com/kb/2822317
I hope the above information helps. Let us know if you need further assistance.
Thank you.