I have downloaded an sss file for the Discovery from 2001 from werdnaforever's Orbital Shipyardthe in the Space Engine forums;
https://forum.spaceengine.org/viewtopic.php?p=23217&hilit=discovery+one+2001a+space+odyssey#p23217

I have followed the instructions to install the sss file into Space Engine and placed the sss file in the spacecraft subfolder as instructed ;
'To install, place an SSS file inside /addons/models/spacecraft. This is relative to the root of your SpaceEngine directory; create it if it's not there
The JSON files can be opened in the ship editor.
if you just want to fly a ship I recommend you just download the SSS file.
If you want to edit the JSON files, you will have to re-edit the SSS file; see here at the "Exporting Ships to SpaceEngine" section'
I did not download the JSON files as I only want to fly the Discovery ship

When I launch Space engine I can't find the Discovery in the shipbuilder to put it into the game.
I am from the older cohort ( nearly 70) and very computer tech challenged.
I watched your excellent tutorial video but couldn't understand much of it as it seemed for more complicated tasks than simply loading a spacescaft sss file into the game.
I would be very grateful if you could help me to get the discovery into Space Engine
I downloaded the sss file from here;
https://drive.google.com/file/d/1YiN4RPYCvvpcAG_4TKYQ6-YpaFDosHUf/view

Image of the Discovery copied from werdnaforever's Orbital Shipyardthe in the Space Engine forums;
https://forum.spaceengine.org/download/file.php?id=8405&t=1&sid=365adb8ffbba9a3ecb97665a617fbc69

Many thanks