I downloaded muse cc 2015, there is not open button, just buy now, it says 29 days remaining.
How do I open the app
do you have a subscription?
if yes, confirm (your adobe id) by checking, Adobe ID
then, if it is current, sign out and then back in to your cc desktop application using the same adobe id used with the above link: http://helpx.adobe.com/creative-cloud/kb/sign-in-out-creative-cloud-desktop-app.html
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