Could someone tell me how to fix this?
"To process SeaDAS OCSSW in Windows see the client/server model model. (Note: previous SeaDAS version 8.0.0 did not support Windows processing but the current SeaDAS version 8.1.0 does support Windows processing)."
This means your Windows SeaDAS 8.1 is the client and sends instructions to the server, which can run on a separate system (linux of macOS), a virtual machine
hosted on Windows, or Windows Subsystem for Linux (WSL).
Windows users have to install the processing software and then configure the "OCSSW Remote Server". Note that WSL gives you a command-line, so you need to follow "Manual installation" procedure. If you have never used linux, you should plan to spend some time learning some basic linux command-line procedures so that you understand the steps described in the manual procedure.