A workaround for using the plugin with the 1.48 version of Calibre (step-by-step instruction for beginners):
- install the plugin in a compatible version of Calibre. Configure it.
- download the zip file with the plugin, unpack it, edit __init__.py in biblionetka.zip (open the file with e.g. notepad and change '2' to '1' in "minimum_calibre_version = (2, 0, 0)"), zip all the files again.
- install the edited plugin in Calibre 1.48.
- find the file 'biblionetka.json' in the folder of the compatible Calibre version (in Calibre Portable: Calibre Portable\Calibre Settings\plugins) and copy it to the equivalent folder of Calibre 1.48.
- enjoy using biblionetka.pl as a metadata source
