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I tried Premiere Pro 2020 and did not like it. I quit the program and I still use my old Premier Pro4. My icons default to the Premiere Pro 2020 and I can't open them.
As soon as you install any part of the Cloud, even a trial, it replaces your program management system-if you plan to keep using CS6 (or earlier) you should NOT install a Cloud program, not even a trial-Read Cloud takes over https://community.adobe.com/t5/Get-Started/Get-off-the-cloud/td-p/8075485 for some ideas
Right click on the CS4 project file and open with...
Navigate to CS4, make sure you check: alway open and hit OK.