In certain cases, the VLC Media Player patches download fails due to the download URL being redirected to different mirror sites. In such cases, you can follow the methods listed below to resolve the issue.
Method: 1
Add the domains listed in VideoLAN to the proxy server's exception list based on your requirement to function without any errors. Ensure that the proxy settings that have been configured has the permission to download files from the respective domains.
Method: 2
Follow the steps given below to manually download the patch and upload it to the patch store directly from console using upload patches option:
To find the Patch Name, navigate to Patches -> Downloaded Patches -> Search for the Bulletin ID TU-021 of VLC Media Player then click on the Patch ID. There'll be a pop-up in which you'll find the Patch Name listed.
For example: 327878-vlc-3.0.18-win32.exe.
(Eg: C: -> Program Files (x86) -> DesktopCentral_DistributionServer -> replication -> store)
If you have changed the location of the patch store, then navigate to the path mentioned in the registry value which has been highlighted in the screenshot below:

If the patch is successfully downloaded automatically from the vendor, there is no need for manually uploading the patches. However, in instances where automatic download fails, you can proceed to manually upload the patches by following the above mentioned methods.
If the issue persists even after following the above-mentioned resolutions, please feel free to contact support.