Serial numbers are not required for creative cloud. They are used for purchased software only. Creative cloud uses your adobe_ID (email). If you need some help, please let us know the details so we can assist you. Here is the website you can visit if you wish to cancel a monthly membership: https://helpx.adobe.com/x-productkb/policy-pricing/cancel-membership-subscription.html If you have a month to month Creative Cloud Complete, Single App, or Photography plan then please see Cancel your membership or subscription | Creative Cloud for information on how to cancel your membership from the Manage Account page. If you have a month to month or annual Creative Cloud Complete, Single App, or Photography plan and are located in a country listed here then please please contact our support team directly. Regards, Pattie ... View more

IF you are prompted to enter a serial number when you start a Creative Cloud (CC) application, see this link for some things to try:https://helpx.adobe.com/creative-cloud/kb/ccm-prompt-serial-number.html. Regards, Pattie ... View more

Antonio- You are correct that you need to deactivate the software if you already have it installed and activated on two computers. Then you will be able to put it on another computer. Depending on whether you purchased software or are using a subscription to creative cloud, here are the methods to use: Best Regards, Pattie For Creative Cloud : Sign in, Sign out | Creative Cloud desktop app For individual purchased software: Activate or deactivate an Adobe product ... View more

For more information on locating or registering serial numbers, please see this link: Find a serial number. Pattie ... View more

Inez- Lightroom is a multi platform program, so you should be able to install on one pc and one mac using one serial number with no issue. The links were provided above. Pattie ... View more

Jonathan, INSTALLING ON ANOTHER COMPUTER: You  can install and activate (purchased) perpetual software two computers  of the same, as long as you only use  it on one at at a time. If you will not ever be using the software on the first computer anymore, deactivate the license on that computer- how to deactivate software.  This allows it to be installed on another computer at any time. To load the software on another computer , download and install it as you did on the first computer. Then enter your serial number to activate it. If you don't have the disks, you can download the software online : Suites and Programs:  CC 2014 | CC | CS6 | CS5.5 | CS5 | CS4 , CS4 Web Standard | CS3 | CS2 UPGRADES: As mentioned above, not all versions of software qualify for upgrades. This  Upgrade information page. is very useful. As far as Photoshop, Here is the upgrade information: I own a previous version of a Creative Suite product or suite edition. Do I get a discount if I upgrade to CS6? Owners of a CS5 or CS5.5 suite edition qualify for upgrade pricing to a CS6 suite edition. Owners of an individual CS5 or CS5.5 product qualify for upgrade pricing on that CS6 product. Any version earlier than CS5 will not be eligible for upgrade pricing. If you use a version prior to CS5, then you can either purchase Photoshop CS6,  or you can subscribe to creative cloud on one of the plans that includes photoshop: Adobe Creative Cloud Regards, Pattie ... View more

Alyson, Generally, when you purchase software, you get the updates free but purchase upgrades to new versions. There are some exceptions, so you can check here to see if you qualify for a free upgrade: Do I qualify for a free upgrade? Pattie ... View more

Kristina, If you need further assistance, see this link Errors "Exit Code: 6," "Exit Code: 7" | CS5, CS5.5 Pattie ... View more

Dennis You are allowed to install cs6 on two machines of the same platform. If you have activated the serial number on two machines already, you will need to deactivate one. In cases where you don't have access to your previous computer, you can ask Adobe Support to help you deactivate. Have your serial number or Adobe ID ready, and then contact us. Pattie ... View more