A little explanation for "How to Install Steam SDK" guide:
1. Here's where you can find older Steamworks SDK version. Specifically ver. 1.42.
2. Download the file and inside it search for ONLY these 3 files:
steam_api.dll
sdkencryptedappticket.dll
sdkencryptedappticket.lib
3. Copy and paste them into your project's js/libs folder.