Read Here:

http://wixtoolset.org/documentation/manual/v3/xsd/wix/customaction.html

And try leaving off Deferred, and look at the SiLabs Installer to see  
if you can pass any parameters, and then Use the Return Attribute to  
wait for the Installer to complete in the background.  If that doesn't  
work you must use a Bundle and Install this as part of the Bundle.

Quoting Fedor Pranovich <fiodar.pranov...@psa-software.com>:

> Hello,
>
> I have one problem with installer
>
>
>  <CustomAction Id="InstallSiLabs_CP210xDriver"
> Directory="PRODUCTDIRECTORYFOLDER" Execute="deferred" Impersonate="no"
> Return="ignore"
> ExeCommand="[PRODUCTDIRECTORYFOLDER]SiLabs_CP210x/CP210xVCPInstaller.exe" />
>     <InstallExecuteSequence>
>       <Custom Action="InstallSiLabs_CP210xDriver" After="InstallFiles" />
>     </InstallExecuteSequence>
>
>
>
> I want to start .exe file, but this file start only in background.
>  But i need run this exe file only in foreground and wait when it will
> finish.
>
> Thanks a lot!!!
>
>
>
> Best Regards,
>
> Fedor Pranovich
<snip>




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