If you upgraded to macOS Catalina and wanted to continue using an old copy of Adobe Photoshop CS5 normally, you're probably out of luck. 32-bit software, like Adobe CS5 products, is not compatible with the newest Apple Mac operating system. Unfortunately, nowadays Adobe wants customers to subscribe to their Creative Cloud (CC) service to continue using their latest and greatest products. Alternatives to common Adobe-related tasks include Affinity Photo and Smile's PDFpenPro. Check out the site Alternativeto.net for lists of recommendations.