It is unlikely you can convert one version of AVS Video Editor projects to another (like from .vep to .vep4). However previously used projects may probably still be imported in the latest version of the software so they can be used to edit or produce video content.
Convert AVS Video Editor project file to AVS Video Editor project file.
We found one software available in the database for this conversion.
Microsoft Windows software - convert vep to vep4 on Windows
A video editing software
Convert from vep 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.