Why different versions

There is a very small change in the Sitefinity API between 7.3.6500 and 9.1.6100, which this package uses. The difference is a missing method overload.

in 7.3.6500 it works like this:

    configManager.SaveSection(section) // By default saves library back-end view settings in configuration files

in 9.1.6100 it works like this

    configManager.SaveSection(section, useFileSystemMode) // It need to pass "true", in order to save settings in configuration files.

However LibraryItemsDownloader.7.3.6500 will work with new versions of Sitefinity, but the settings will go in the database. And then image that: one settings are saved in configuration files, others in the database - total mess.

Be careful which version to install! Please read the Installations page.