A "verified" install ensures the game's executable ( game.exe ) has not been modified, which is critical to avoid being banned on official servers.
Classic Diablo 2 relies on outdated video modes that can cause modern displays to look washed out or stutter. Use these system tweaks to optimize your verified installation: Video Options and Windowed Mode diablo 2 lod 114d verified
A crucial change in the 1.14 patches is the authentication method. To play online on Battle.net, you must log into your Battle.net account and redeem your game keys. The game will then "attach" the license to your account, allowing you to log in without needing the CD in your drive. A "verified" install ensures the game's executable ( game