I have installed the very first version of plugin.
Then I installed v. 0.2.0
kiwidude says that you have to remove "Find Duplicates.json" file.
https://www.mobileread.com/forums/sho...5&postcount=33
I couldn't find the file (and was lazy to use "search" tool on my filesystem, because I have a few large testing Calibre libraries).
So I didn't remove Find Duplicates.json
Bad Things (TM) started to happen. Like crash of Calibre.
So, if you run on Linux, like I do, go to the ~/.config/calibre/plugins and remove "Find Duplicates.json" file before installing v. 0.2.0. You can also remove file *after* Calibre starts to crash on startup. Like I did ;-)