Watch the video:
Timestamps:
0:00 - Explanation
0:36 - Error opening in a previous version
1:06 - Editing project file
3:00 - Opening 2021 PrProj in 2019
3:18 - Note about Plug-ins and more
3:50 - XML method [Doesn't copy effects]
Need to open a newer project in an older version of Premiere Pro whether it be for performance, plugins, or something else? Well, you’re not able to do it without editing the project file. This video shows you exactly that. It also has another method that you may like more at the end.