As my experiences, you can try to convert the Ver2.2 of IDF into Ver 3.0 by opening IDF Ver.2.2 with E+3.0, then click "file-transition version", the transition of IDF from V2.2 to Ver 3.0 will be finished. Then using E+3.1 to convert Ver.3.0 to Ver3.1.... In this way, you will finish the transition from V2.2 to V5.0 successful.Â