Once Setup and Once Mobile on Microsoft Windows requires some Microsoft Library files to be in place to run.

The Once installers attempts to install these files if they are missing from your PC but occasionally this process can fail - usually due to permissions.


If when starting Once Setup you get error message:

The program cannot start because MSVCR120.dll is missing from your computer


You can download and install these files directly from Microsoft using this link and select vcredist_x86.exe

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After downloading this file, double click the file or select run (depending on your browser) to run the installer.


If the problem is with starting Once Mobile for Windows and the error is:

The program cannot start because MSVCP140.dll is missing from your computer


Download and install these files directly from Microsoft using this link and select vc_redist_x64.exe.

 

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After downloading this file, double click the file or select run (depending on your browser) to run the installer.