InDesign low memory and old software on new platforms
A few years ago Adobe largely switched to a subscription model for its creative suite, now called Creative Cloud. While you can still buy individual components for some products, its recurring monthly and annual deals give access to what were formerly several thousand dollars’ worth of software purchase separately (even if you don’t use all of it), as well as frequent updates that add new features alongside bug fixes.
This can cause problems for users of older Adobe products, because while the company retains a commitment to keep current stand-alone versions up to date as operating systems advance, it’s a bit different from the olden days when Adobe and other companies sometimes released compatibility fixes a couple versions out of date for big installed-base applications. (Intuit has continued to release OS X updates for Quicken 2007 for Mac, which I still use, as its newer Quicken still lacks full feature parity.)