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Upgrading the software does not cause loss of a library - so if you think this is the symptom you are seeing then something else is at play. The question is whether the library is really going missing or something is causing Calibre to lose track of where it is located.
The first thing is to check if you even currently have your library on the hard disk? Do you know what folder you specified to hold the library? If so you probably want to check that it contains the file metadata.db and folders for each author containing book files. If you are not sure of the location then simply searching for the file metadata.db should help you find it. If you really do not have the Calibre library physically present on your disk then something else is removing it - it will not be the Calibre upgrade which never touches existing libraries.
The "switch/create library" that was mentioned is an option that is offered if you click on the Library icon in Calibre. It allows you to tell Calibre where a particular library is located if for any reason Calibre has lost track of its location. Ideally you would use it when you have located the library as described in the previous paragraph.
Note that you can turn off the message that advises you about calibre updates iva the Calibre Preferences - with a weekly update cycle they happen frequently. However most people like to know they have happened even if they do not install all the updates.
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