Because the original discs rarely work on modern operating systems, the best way to download the game is through digital storefronts that specialize in "retro-fitting" old software.
Often bundled with the "Royal Edition" (which includes the Siege expansion), the Steam version is a reliable, cloud-synced option for modern hardware. Making it Run on Modern PCs ⚡ Quick Fixes for Modern Hardware: Lords of the Realm 2 Download PC Game
Modern CPUs can make the map scroll too fast. Adjust the "Cycles" in your DOSBox configuration file to slow it down. Because the original discs rarely work on modern