Diablo III The Frozen Thorne cannot be installed

Diablo III The Frozen Thorne cannot be installed, because Warcraft 3 Reforged always appearing as a suggestion to install latter game
I downloaded from Warcraft 3 Reforged, with the link I found in Polish website.
Later I bought Warcraft III The Frozen Thorne from G2A. Serial was confirmed as valid. Now I cannot see Warcraft 3 The Frozen Thorne in battle net app.
Help me to find the bug

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Buying from shady grey third party seller sites is always a risk. The keys for Frozen Throne no longer work so you were sold a dead key.

You can read the Support Article about Warcraft III here. It covers rolling Frozen Throne into the base game, and how to access it via WC3 R or Reign of Chaos key.