Also, your "Job Spy.json" file in your plugins directory should have a line that looks like this:
prefs['GUI_TOOLS_ACTIVATE_TWEAK_SAVE_COVER_SEPARATELY_BY _LIBRARY'] = .....
If that is not "True", then nothing is done for that tweak. As the JS customizing ToolTips say, you must restart Calibre after changing any of the JS tweak activations or default values.
You indicated earlier that you had copied your "Job Spy.json" file from your old PC to your new PC. Verify that file.
Also, confirm that you are on the very latest version of JS.
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