Quote:
Originally Posted by jeffwalker
Okay, thanks.
I'm using a mid-2011 27in iMac which won't update beyond High Sierra, hence the question.
Currently I lack the resources to buy a new 27in iMac. 
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Thanks for your questions and also for all the answers. kovidgoyal: fantastic app you have created by the way. I have a simple question related to this: I am similarly using a 2011 Macbook Pro and will stay with the 3.X version of Calibre for now on that. I am also using a Mac Pro desktop which is on Mojave and so I was thinking about updating to 4.1 on that. But since I share the book files database between the two computers on Dropbox, I don't want to install 4.1 and then find out later that it has somehow "updated my database" and rendered it unusable with the 3.X versions. Do I have nothing to fear and I can use the same database with both versions? I suspect I can, but just want to be sure. Thanks!