added note for vlc plugin installers

INSTALLVLCPLUGIN/README.md

@@ -1,6 +1,8 @@
 # VLC Media Player (Inter Digital VLC VTM Decoder Plugin)
 
 ### Installation (Windows only)
+This can work only for VLC 3.0.9.2 and later version (eg. 3.0.17.4). VLC 4.0.0-dev won't work.
+
 To install Inter Digital VLC VTM Decoder Plugin, you need VLC Media Player latest version installed on your computer and supported 64-bit.
 
 Step 1: Copy libvtmdec.dll and libvvcdecoder_plugin.dll into your VLC Media Player folder following folder: VLC/plugins/codec
@@ -16,7 +18,7 @@ Step 3: Enjoy and play your h266 file into your VLC Media Player :).
 
 ### Alternative using command line:
 
-Open Windows Terminal/Windows Command Prompt, make sure you do cd of C:/Users/(put your username)/Downloads/VVCEasy/INSTALLVLCPLUGIN/VLC
+Open Windows Terminal/Windows Command Prompt, make sure you do cd of C:/Users/(put your username)/Downloads/VVCEasy/VLC
 
 Copy code following:
 ```
@@ -25,4 +27,12 @@ copy libvvcdecoder_plugin.dll "%programfiles%\VideoLAN\VLC\plugins\codec"
 copy libvvctsdemux_plugin.dll "%programfiles%\VideoLAN\VLC\plugins\demux"
 ```
 
+Note to VLC 4.0.0-dev users:
+
+The VVC video file cannot loaded by newest version of VLC 4.0.0-dev, because it is nightly build and it's unstable.
+
+For more information about VLC 4.0.0-dev see: https://www.theverge.com/2021/2/12/22279750/vlc-4-0-new-user-interface-videolan-media-player-video-music-movie-database-web-player
+
+I tried build two DLL files on VLC 4.0.0 SDK, but the compiler failed, so you have to use VLC 3.0.9.2 and latest of VLC 3 version branch.
+
 - Martin Eesmaa