Collectorz now appears to be focusing on their mobile and web-based products for managing book collections, but they also provide a desktop Book Collector desktop application for systems running Microsoft Windows, though I don't even see a link for it on the homepage of their website nor do I see one in their sitemap webpage. However, if you are using the desktop product and need to update your Book Collector database if the location of cover images, thumbnails, list item images, templates, and/or local files for entries already in the datbase, you can take the steps below. You can specify the directories for new entries by clicking on Tools, Options, Folders to set the directories Book Collector should use by default.
Inside the Book Collector program, click on Tools then select Update File Links. In the Update File Links window you can "choose the kind of files you would like to repair". I left the default value of All Types, but you can also select Front Cover, Back Cover, Pick List Image, Pick List Template Image, Local File, or Backdrop. When you click on Next Step, you can choose to have the program automatically update the old folder to the new folder or you can choose to do it manually. With the automatic option, you can "Select a base folder and let the program find the missing files automatically" while with the manual option you can "Use a find and replace action to manually fix your file paths". For the "Choose folder where to find files", browse to the appropriate directory where the files are now located. Check the box next to "Include subfolders", if that is appropriate, and then click on Next step. The program will then show a "Finding best matches for missing files" window with a progress bar as it updated links.
At the next step, Step 4, you can see the resulting file paths and click on the Update File Links button to finalize the changes. You will then see the number of file links that will be updated and asked if you are sure to proceed. I saw a window with a message that Book Collector was not responding, but I chose "Wait" several times and it finally completed. When all the links are updated, you should see a window informing you of the number of file links updated. If you updated the location for the images for books already in the database, you should now see the images appear for book entries.
If you just need to update the links for a particular kind of files, e.g., the local files, or the location of those files differs from the location of other files, e.g., if they are on a different drive than the images, etc., at Step 1 where you "choose the kind of files you would like to repair", you can choose that file type instead of "All Types".
I was able to use the above steps when transitioning my wife's desktop computer from Windows to Ubuntu Linux, after I installed Book Collector under Wine, to specify the new location of image and local files.
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