A.T. Robertson Commentary Revelation 16:11

"and they blasphemed the God of heaven because of their pains and their sores; and they repented not of their works." — Revelation 16:11 (ASV)

They blasphemed (εβλασφημησαν)

and they repented not (κα ου μετενοησαν). Precisely as in verse 9, which see. Not just because of the supernatural darkness, but also "because of their pains" (εκ των πονων αυτων, plural here and same use of εκ) and their sores (κα εκ των ελκων αυτων, as in verse 2, only plural, and same use of εκ).

Of their works (εκ των εργων αυτων). "Out of their deeds," and addition to verse 9.The God of heaven (τον θεον του ουρανου). As in Da 2:44. Like the pride of Nebuchadrezzar against Jehovah.