Blizzard has vowed not to replace Diablo 2 with Diablo 2: Resurrected. In a Q&A video, someone asked “Will Diablo 2:Resurrected overwrite an original Diablo 2 installation?” The principal designer Rob Gallerani responded ””No, absolutely not. Everything you have about D2 currently will stay D2. This is a separate product, a separate game. You can play ’em both at the same time if you want”
You should get why this is so worrying if you saw the Warcraft 3 Remaster. When the Warcraft 3: Reforged launched, Blizzard suddenly removed the original Warcraft 3 client from Battle.net. And this made some features from the original Warcraft 3 inaccessible. We sure hope that won’t happen with Diablo 2 too. But the good news is Blizzard confirmed mod support for Diablo 2: Resurrected.