Viscera Cleanup Detail (246900)

When starting Viscera Cleanup Detail, at step 1 of 4(or 6) ('installing: Epic Redist Package), I get a popup for Microsoft .NET installation that seems to start fine but eventually freezes at:
'Downloading windows6.1-kb958488-v6001-x64.msu'
I tried letting it run overnight but it never finished.

Terminal dump:
GameAction [AppID 246900, ActionID 3] : LaunchApp changed task to ShowLaunchOption with ""
GameAction [AppID 246900, ActionID 3] : LaunchApp waiting for user response to ShowLaunchOption ""
GameAction [AppID 246900, ActionID 3] : LaunchApp continues with user response "0"
Loaded Config for Local Override Path for App ID 246900: /home/cuddlz/.local/share/Steam//controller_base/empty.vdf
GameAction [AppID 246900, ActionID 3] : LaunchApp changed task to ProcessingInstallScript with ""
Proton: Upgrading prefix from None to 3.7-2 (/media/3TB/SteamLibrary2/steamapps/compatdata/246900)
GameAction [AppID 246900, ActionID 3] : LaunchApp changed task to RunningInstallScript with ""
p11-kit: couldn't load module: /usr/lib/i386-linux-gnu/pkcs11/p11-kit-trust.so: /usr/lib/i386-linux-gnu/pkcs11/p11-kit-trust.so: cannot open shared object file: No such file or directory
p11-kit: couldn't load module: /usr/lib/i386-linux-gnu/pkcs11/gnome-keyring-pkcs11.so: /usr/lib/i386-linux-gnu/pkcs11/gnome-keyring-pkcs11.so: cannot open shared object file: No such file or directory
p11-kit: couldn't load module: /usr/lib/i386-linux-gnu/pkcs11/p11-kit-trust.so: /usr/lib/i386-linux-gnu/pkcs11/p11-kit-trust.so: cannot open shared object file: No such file or directory
p11-kit: couldn't load module: /usr/lib/i386-linux-gnu/pkcs11/gnome-keyring-pkcs11.so: /usr/lib/i386-linux-gnu/pkcs11/gnome-keyring-pkcs11.so: cannot open shared object file: No such file or directory
p11-kit: couldn't load module: /usr/lib/i386-linux-gnu/pkcs11/p11-kit-trust.so: /usr/lib/i386-linux-gnu/pkcs11/p11-kit-trust.so: cannot open shared object file: No such file or directory
p11-kit: couldn't load module: /usr/lib/i386-linux-gnu/pkcs11/gnome-keyring-pkcs11.so: /usr/lib/i386-linux-gnu/pkcs11/gnome-keyring-pkcs11.so: cannot open shared object file: No such file or directory

Steam System Information:
https://gist.github.com/Cuddlypuff/a518019d119623d9a1b7552e284c1f6d

No repository file or test is identified. Start with the terminal dump for AppID 246900 and the linked Steam System Information, then investigate the freeze while downloading the Microsoft .NET package. Done means isolating a reproducible cause or documenting a verified resolution.