How I Solved The Windows Error Code 1618 Another installation is already in progress. Complete that installation before ...
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What happens?

When running Setup to install Microsoft Office programs, this error occurs because Microsoft Windows Installer can only run one installation at a time, unless it is a nested installation.

Do not despair because Another installation is already in ...

The fix is simple: wait until the software which is currently installing finishes the process. Restart the computer if necessary, then install the next program.

TipFor more information, please see: How to fix Update error #1618

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