Can't find the server download for Windows 10

[theguymadmax]

Just to elaborate on a couple of points in your post:

1. Should I keep running a computer with Windows 8.1
-No. 

• Windows 8.1 went into End of Life(EOL) on 1/10/23. Meaning that Microsoft is no longer supporting that product, any security exploits found will not be patched by Microsoft.
  
• Third-party applications will or have already dropped support for this OS.
  

2. What is the difference between the two files, and which one do I need?

• The exe is a standard installable executable file that will run you through all the prompts to install Jellyfin. Jellyfin will automatically start with a Windows tray program. – You should use this one
  
• The zip file is a portable installation. You unzip it to any location and then manually run the program exe through a command prompt or set it up a service.
  
• Both installation methods will work with either Intel or AMD.
  

3. If I have to upgrade to Windows, should I upgrade to Windows 10 or 11

• Window 10 EOL is Oct 2025, so definitely go with Windows 11*
  

*Note Windows 11 has some hardware requirements that your PC might not meet, which can be bypassed by using Rufus to create your installation media.