To be direct: Adobe Creative Suite (CS5.5) is "end-of-life" software.
If you already own the software, you can retrieve your unique 24-digit serial number (six groups of four numbers) using these methods: Adobe Account : Sign in to the Adobe Accounts page and look under Plans and Products . Registered serial numbers are typically listed there. Purchase History
Adobe Master Collection CS5: Licensing and Ethical Use Adobe Master Collection Cs5 5 Serial
If you previously purchased a legitimate license, you can generally find your serial number through the following official channels:
Affinity Suite: (Photo, Designer, Publisher) provides a one-time purchase model similar to the old Adobe days. To be direct: Adobe Creative Suite (CS5
Mac: Newer Macs running macOS Catalina (10.15) or later cannot run CS5.5 because Apple removed support for 32-bit applications. The last compatible version was macOS Mojave (10.14).
Why Do You Need a Serial Number?
Conclusion