Do you receive this error when you start Adobe Muse?
"Unable to validate your Adobe Muse subscription. We haven't been able to validate your Adobe Muse subscription for some time. Please connect to the Internet in order to continue using Adobe Muse."
Try the solutions in this document.

Follow the instructions for your operating system.
Caution: Make sure that you delete the correct files and folders from correct locations to avoid irrecoverable loss of data. If you are in doubt, contact support.
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Opomba:
Don't see the Library folder? See Access hidden user library files | Mac OS 10.7 Lion for assistance.
Start a web browser, such as Firefox or Internet Explorer, and visit https://na1mbls.licenses.adobe.com.
- If you can reach this website, your computer can connect to Adobe's subscription server. Go to the next step (Send the PDApp.log file to Adobe).
- If you can't reach this website, your computer can't connect to Adobe's subscription server. Troubleshoot firewall issues. Consult your network administrator or your home network’s firewall documentation.