If you purchased Adobe Student & Teacher edition product, you may have received a serial number or a redemption code. See Serial numbers, redemption codes, and product codes | Student & Teacher editions.
If your serial number is for a different language than the installation language you select (for example, you purchased a German Creative Suite, but attempt to install it in English), you will get an invalid serial number error. Reinstall the product, choose the correct language, and enter the serial number when prompted.
The Creative Cloud Cleaner Tool is designed to run after you uninstall your Adobe application. Run the appropriate uninstaller to remove the application producing the invalid serial number error first, and then run the Creative Cloud Cleaner Tool.
Permanently Offline If your computer is permanently offline (i.e. secure environments like government, banking etc.) you need to complete an offline activation within 7 days of the first launch of the software otherwise it will stop working. You need an internet enabled device and your product's serial number to complete this process. 2b1af7f3a8