You have to customize the options for your specific situation. 'Invalid' means not valid for the current library. Read the ToolTips and original post, including its attachments. The 'collage' is complex but well worth analyzing.
If you are new to Calibre, you will need to learn about Calibre before using MFI.
MFI is cross-platform (OS) like 99% of Calibre plug-ins.
DaltonST
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