Latex’s problem about package missing

Latex Error:File ‘etoolbox. Sty ‘not found latex Error:
latex Error:File 'etoolbox. Sty' not found
What should I do when I make such a mistake?

    click in download file with the same name. Copy etoolbox. Sty and Etoolbox. Def to../Tex /latex/ EToolbox/below EToolbox. PDF copy to../Doc /latex/ EToolbox/MiKTeX open Setting, General — & GT; Refresh FNDB and restart WinEdt.

Sometimes the download is ins and other files, how to do?
, add a step after the top 3. CMD switch to the current directory, and execute latex toolbox. Ins to generate the.sty file, then refresh.

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