how to reinstall InDesign on older mac I'm running an older powermac. I don't want to buy a new computer, this one is still plenty fast and capable. But, it won't install an OS past High Sierra (10.13) So, everything was running great until a couple of days ago, when something in Indesign got corrupted. Now, my command, option, shift, control key combinations don't work; for example, I can't use option-drag to make a copy, or I can't use shift-drag to scale or constrain. That absolutely is a deal killer. All I want to do is reinstall Indesign 2018, which is the latest version of Indesign this OS can run. But, there's no option to reinstall. I followed the instructions on Adobe's and it advises to uninstall Indesign, then Reinstall. But, the only option to reinstall once this is done, is the current incompatible version. That required a restore from backup to resolve (And, no restoring from backup didn't fix the command keys issue) Now I'm stuck. How do in reinstall Indesign 2018 when I can't install the