The GSF ID is a supercookie that evolved from the Android ID, which was/is baked into the Android Framework itself. Originally, it was more or less guaranteed to be valid for life. Nowadays, it lives inside the Playstore app and may expire or become otherwise invalid. When that happens, Play forgets the associated hardware profile, resulting in empty search results.
Since not all causes for a breaking GSF ID are known, the new commandline argument just fixes the problem by simply registering a new GSF ID.
Maintenance release. Changes:
NOTE: This change will not update existing profiles.
If you do not have problems with Raccoon being unable to log your Google Account in, stay with version 4.18.0.
Added –gpa-download-dir commandline argument to download APK files to an external path, which is not tracked by Raccoon.