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[Mocktwo]

I am running Windows 11
I recently upgraded from MC30 to MC33 ... now whenever I try to play a video I get a message "adding required components" and then the error of "Failed to download and install the 'LAV Splitter' file. Check your network connection and permissions.". Playing audio is fine.

I spent the last couple hours searching all over this Wiki and most of what I found indicated firewall restrictions. I use the default Windows Defender. After I installed MC33 I was prompted by Defender and I clicked allow for everything. I searched this Wiki for firewall rules, setup ... ugh. I didn't find anything current or useful. A few posts saying "should create firewall setup instructions" - but possibly didn't cause I can't find any.

So, I went into Defender rules (there were many for MC33 & Media Center), deleted them all hoping to be prompted again, but I have not been prompted again. So then I completed disabled (turned off) Firewall protection for Private, Public and set domain to Allow all inbound. (allow all outbound is default). I also disabled Real-Time AV protection. Re-booted, re-started MC33 ... still fails.

I checked my %appdata%\J River\Media Center 33\Plugins - only an empty "lav64" folder.
I checked my %appdata%\J River\Media Center 30\Plugins - lav64 was populated, also avcodec64, libplacebo64 & mp3_encoder
So I copied the lav64 files to the MC33 lav64 folder ... still fails.

What am I missing? 

[JimH]

Try power cycling your router and everything on your network.  It's probably a DNS issue.

[Mocktwo]

Thanks JimH.  I had my doubts, but after power cycling my modem and router, it's all good.  And I checked the plugins folder ... all populated properly now.