Although you can import previous versions of Guitar Pro projects (such as .gp4) to the latest version of the program, you cannot produce any of the previously used formats because the latest Guitar Pro projects (.gpx) are not backwards compatible.
This means that a direct gpx to gp4 conversion is likely not possible.
This conversion entry was verified by us and conversion was flagged as wrong or not possible.
Usually this happens when the conversion would try to convert different types of data between each other, such as audio to image, or it is not possible because incompatibility between programs, caused by closed file formats, very limited support etc.
If you find entry that you feel is flagged as bad wrongly, please tell us in the discussion below with as much as information as possible so we can fix it.
