I have Calibre 5.17, and it can't convert a Tpz I bought recently. When I click convert, I get a message which says "Could not convert the book because no supported source format was found." Does this mean that new versions of Calibre do not convert Tpz anymore, and if so, what was the last version that did? It's really annoying that this file is Tpz given how out of date it is, but there it is.
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