From the error message, I would suspect that you tried to install from an unzipped copy of the job_spy.zip file, you selected the wrong file or your OS unzipped the file for you.
Basically, there are two ways to install Job Spy.
If you downloaded the job_spy.zip file from the linked thread, you would open calibre preference => plugins => Load plugin from file and then browse to the location of job_spy.zip and select it. Click yes on the Installing plugins is a security risk then select the toolbars where Job Spy would be added.
The other choice would be Preferences => Get plugins to enhance calibre button, select All in Filter list of plugins and enter job in the Filter by name box. This should show Job Spy which you would then select and install with the same warning and options as above.
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