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This error suddenly appeared in my file! It was not before what should I do?

File `calc.sty' not found. \RequirePackage

David Carlisle
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Ali abbasgun
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    The calc package is part of required tools bindle so should be available in every latex installation. If you are using miktex then update latex-tools in the miktex console – David Carlisle Jan 19 '21 at 20:51
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    If you are using miktex this is most likely a duplicate of https://tex.stackexchange.com/questions/578956/miktex-after-recent-upgrade-where-are-documentation-for-packages-array-longtab/578988#578988 – David Carlisle Jan 19 '21 at 20:52

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I'm not expert but I try this and worked.

Copy all in this link: https://web.mit.edu/ghudson/dev/nokrb/third/tetex/texmf/tex/latex/tools/calc.sty

Paste in a note block and save as calc.sty where is save your .tex file

Mario Alcala
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    Welcome to TeX.SE. This would solve OP's problem, but wouldn't really address the underlying issue that TeX isn't finding a package that should be somewhere on OP's computer. – Teepeemm Nov 05 '21 at 15:46