There is currently no way to reconstruct old EDIUS projects (.epj files from version 2.5 or so) from projects made in some of the later versions with use the .ezp extension. In other words, you cannot create old projects from new projects, EDIUS does not support this function.
Convert EDIUS project to EDIUS Pro project.
We found one software available in the database for this conversion.
Microsoft Windows software - convert ezp to epj on Windows
A professional video editing software
Convert from ezp file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.