10 year old legacy software won't run on Mac Catalina, Big Sur or Monterey. It's time to get compatible software if you want to keep using Mac Catalina or higher. My guess is you need a modern OS a lot more than you need decade old software.
Depending on your requirements, you have a few options.
Creative Cloud Photography Plan (approx $10/month for 12 months). Includes the following: - Photoshop CC and Photoshop on iPad - Lightroom on desktop, mobile and the web - Lightroom Classic - Portfolio website + hosting - Spark with premium features - Bridge - 20 GB cloud storage (upgradable to 1 TB). https://www.adobe.com/creativecloud/photography.html