Steamworks.NET: upgraded to 10.0: [Steamworks.NET] Could not load [lib]steam_api.dll/so/dylib. It's likely not in the correct location.

my standalone builds are crashing pretty much immediately when launching my game after upgrading to 10.0. i see this error -

quit reason: [Steamworks.NET] Could not load [lib]steam_api.dll/so/dylib. It's likely not in the correct location. Refer to the README for more details. System.DllNotFoundException: C:/Users/chase/builds/cb/cb_Data/Plugins/CSteamworks.dll at (wrapper managed-to-native) Steamworks.NativeMethods:SteamAPI_RestartAppIfNecessary (Steamworks.AppId_t) at Steamworks.SteamAPI.RestartAppIfNecessary (AppId_t unOwnAppID) [0x00005] in C:\Users\chase\Documents\dev\unity\projects\cb2\Assets\Plugins\Steamworks.NET\Steam.cs:56 at SteamManager.Awake () [0x00086] in C:\Users\chase\Documents\dev\unity\projects\cb2\Assets\Scripts\Steamworks.NET\SteamManager.cs:79

i followed the upgrade instructions using the unitypackage, not sure where i went wrong. i’ve been using an older version of Steamworks.NET pretty much without issue for months.