Step 1 – Install VLC.

Visit Videolan.org, download and install the latest version of VLC media player on your computer.

Step 2 – Download keydb.cfg and aacs library.

Click here to download keydb.cfg file or Go to http://fvonline-db.bplaced.net/ and find the database file you need. and unzip it.
Windows: put the keydb.cfg in C:\ProgramData\aacs

Download Bluray playback with libaacs & libbdplus  or https://winappcenter.com/download/blu-ray/libaray/2020-07-26_libaacs_libbdplus.7z and unzip it.
32Bit VLC: put the 32 bit dlls  to your vlc root directory.
64Bit VLC: put the 64 bit dlls  to your vlc root directory.

Step 3 – Copy the keydb.cfg file to your C:\ProgramData\aacs folder.

Step 4 – Copy the aacs.dll file to your VLC directory.

Right-Click the Shortcut of VLC media player on the Desktop and Click the "Open file location" to open the vlc directory. And then copy the aacs.dll to the folder of vlc.

Step 5 – Finally, you can easily play Blu-ray on VLC media player.

Start VLC, open the "Media" menu, and select the "Open Disc..." menu item. An Open Disc dialog box will appear. Select the DVD you want to open and select Open.