Plex Media Server won't startup after reinstalls on Windows 10

Plex Media Server Desktops & Laptops
2

Another curiosity I just noticed: There’s no Plex folder in %localappdata% to speak of. The program is installed at C:\Program Files (x86)\Plex\Plex Media Server but there’s no folder in local app data.

I uninstalled Plex again and tried to install again. When Plex Media Server Setup is running, it stalls at the last step (Processing: Plex Media Server) for several minutes before the installer says everything was successful. The installer has created two folders in %localappdata%\Temp:

{09199D3C-0509-4D3B-A3D5-FA65EFE7E71E}
∟ .cr
   ∟ PlexMediaServer-1.18.4.2171-ac2afe5f8-x86.exe

{BCB9DA95-FFBD-41E1-8C8E-1C1DCF509BF0}
∟ .ba
   ∟ 1028
      ∟ ...
   ∟ 1031
      ∟ ...
   ∟ 1036
      ∟ ...
   ∟ 1040
      ∟ ...
   ∟ 1041
      ∟ ...
   ∟ 1042
      ∟ ...
   ∟ 2052
      ∟ ...
   ∟ 3082
      ∟ ...
BootstrapperApplicationData.xml
logo.png
plex-chevron-85.png
progress-bar.png
thm.wxl
thm.xml
wixstdba.dll