There has been a bunch of tips and tricks about opening a newer version of .prproj file in earlier version of premiere pro. I've tried extracting the 2021 file with 7zip, changing the version line via notepad and then re-archiving it to open it as a premier pro file. it still ain't work. there's the so-called error: The project could not be loaded, it may be damageed or contain outdated elements.
I'm almost at my wits end, cz I've got lots of projects done in premiere 2021 and I need to open them up in 2019 as I downgraded months ago due to some technical issues with 2021.
Thank you for your kind response. I have never thought of exporting exporting and importing an .xml file which I have had nothing to do with so far. Although it has its own drawbacks as you also mentioned - unable to export many effects, for instance - at least it gives you the timeline so you can access the data clearly.
Twas a wise workaround, helped me a lot and I am very grateful 😉