NSIS 判斷特定程式是否已安裝(How to check and install MySQL .NET Connector)

資料來源: https://nsis.sourceforge.io/Mysql_connector

   ; check MYSQL Connector 5.0.3
   IfFileExists "${PROGRAMFILES}\MySQL\MySQL Connector Net 5.0.3\*.*" mysqlfound
       Return
   
   mysqlfound:
       File MySql.Data.msi
       ExecWait "$TEMP\MySql.Data.msi /quiet"