Open the Creative Cloud desktop app.
Creative Cloud apps don't require a serial number. Try the solutions to fix this error.
The serial number error may be triggered by a connection or set-up issue. Work through the following solutions one by one until you can sign in again.
See two Adobe logos?
If you see two Adobe logos, you have access to the activation servers. Now sign in to your Creative Cloud app again.
Don't see the Adobe logos?
Check your internet connection and try to access the Adobe activation servers again. You need a secure connection when signing in to an app. Then try to sign in to your Creative Cloud app again.
For help with signing in, see how to sign in to (or activate) your app.
Follow these steps to verify that you have an active Creative Cloud subscription:
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Select the Account icon in the upper right, and then select Sign out.
Does your screen look different?See instructions for the earlier version of the Creative Cloud desktop app.
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Sign in again to your Creative Cloud account.
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If you aren’t using the latest version of the Creative Cloud desktop app, a prompt to update appears. Select Update.
Check your payment details
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Sign in at https://account.adobe.com/plans.
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Select Edit billing and payment.
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Select either Add new or Edit.
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Confirm that your payment details, billing address, and phone number are correct.
If the details are incorrect, update your billing details with the correct information.
Using a corporate card?Always use the cardholder's name and billing address, not your own. Check with the cardholder or your accounting department to verify the correct name and billing address.
If you purchased an English-only subscription, make sure that the default language setting in the Creative Cloud desktop app is English (International).
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Open the Creative Cloud desktop app.
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Select the Account icon in the upper right, and then select Preferences.
Does your screen look different?See instructions for the earlier version of the Creative Cloud desktop app.
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Select Apps in the left sidebar.
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Under Default install language, ensure that English (International) is selected, and select Done.
You have successfully changed the Default install language of your Creative Cloud apps.
An inaccurate computer system clock can cause activation issues. Ensure that your computer's system clock is set to the correct date and time.