I'm not on PC bro, but I found this comment maybe it will help you... 🤞
""A kind user reached out to me advising that older versions of the DeoVR App on Steam do at least have alpha-packing videos working properly.
I did some testing and up to version 14.1.2235 does indeed have functional alpha-packing.
For those who are interested in rolling back:
Navigate to the following URL: steam://open/console and open the link using the Steam Client Bootstrapper (might need to have Steam already running - not sure).
In the console enter:
download_depot 837380 837381 9195184036657754427
That will download the specific DeoVR version. The download will show no progress until it completes (or errors out for some reason - might have to try again if it does) at which point it will print out where the files got downloaded, probably C:\Program Files (x86)\Steam\steamapps\content\app_837380\depot_837381 or something like that.
Maybe make a backup of the common\DeoVR Video Player folder (in SteamApps folder - wherever your games go). Move the files you downloaded to there, replacing everything.
To prevent Steam from updating the app: Find the appmanifest_837380.acf file in your SteamApps folder and set the file attributes to read-only. This technically should cause Steam errors when attempting to update the app. Haven't quite verified yet, but it appears to be working.
Hope that helps someone"""
If it dont help, I'm sure someone with the right expertise will assist you.👍