You open the .flp file in a Hex Editor and locate the byte sequence that denotes the FL Studio version number. By carefully changing these specific bytes to match the version token of an older release, you can often bypass the "newer version" block.
If you want to avoid the risks of file corruption and plugin loss, there are industry-standard alternative methods for sharing projects between mismatched software versions. Method A: Exporting Project Bones flp downgrader
