Is it obligatory to delete impermissible programs and channels that the questioner previously downloaded for his relatives? Is it sufficient to advise those whom he taught how to download channels and programs to rid himself of sin? And is he sinful for downloading religious channels that contain anasheeds and music?

A Muslim is not permitted to assist in disobedience [to God]. Whoever knows that what he teaches will be used for evil is a participant in sin. Nevertheless, whoever repents sincerely, regretting his sin, God accepts his repentance and forgives him. Part of complete repentance is to exert effort in removing whatever corrupt programs you can, and advising those you helped. As for downloading religious channels, it is a righteous act, unless they broadcast musical instruments, in which case it is not permissible to assist in downloading them.