Karl Berry karl at
Fri Aug 2 23:38:39 CEST 2019

    Does someone know what has happened to baposter in the last 10 years
    or so?

There is no baposter package on CTAN, and no baposter.cls (or .sty) file
has ever been in TeX Live or its predecessors. I can only surmise you
installed it from the "wild". --best, karl.

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