I joined monthly and when I try to install it asks for a serial number

[johncecilian123]

I don't have a serial number, and the only two options are trial or serial number

[Manish-Sharma]

Use it as the Trial and then  enter your Adobe id and password to link it with your CCM subscription

[David__B]

I'm moving your question over to our installation forum.

For general Creative Cloud Membership questions, here is the FAQ link:

http://www.adobe.com/products/creativecloud/faq.html

-Dave