Buggy, bulky, heavy, crashy, no portable version, slow development, bugs are usually neither fixed nor investigated, suggested features are not implemented, its issues page looks like a forgotten sepulchre, the developers (too many devs doing too little work) usually no longer comment on new issues and the project might already be abandoned for good. Conclusion, Persepolis Download Manager is hopeless (I once tested it on Windows and gave up on reporting problems as my reports were ignored).