!macro CheckVersion
  FileOpen $4 "$INSTDIR\DB\config\VERSION" r
  FileRead $4 $1
  FileClose $4

  ${If} $1 != ""
    ${StrStr} $0 $1 "${CURRENT_VERSION}"

    ${If} $0 == ""
       ${StrStr} $0 $1 "${MIN_REQUIRED_VERSION}"

       ${If} $0 == ""
         MessageBox MB_OK "This version can only be installed on ${MIN_REQUIRED_VERSION}.x systems, you have $1"
         Quit
       ${EndIf}
    ${EndIf}
  ${EndIf}
!macroend

!macro CheckVersionEx
  IfFileExists "$INSTDIR\DB\config\VERSION" isDB isCollector
  isDB:
    FileOpen $4 "$INSTDIR\DB\config\VERSION" r
    Goto check
  isCollector:
    FileOpen $4 "$INSTDIR\Collector\config\VERSION" r
  check:

  FileRead $4 $1
  FileClose $4

  ${If} $1 != ""
    ${StrStr} $0 $1 "${CURRENT_VERSION}"

    ${If} $0 == ""
       ${StrStr} $0 $1 "${MIN_REQUIRED_VERSION}"

       ${If} $0 == ""
         MessageBox MB_OK "This version can only be installed on ${MIN_REQUIRED_VERSION}.x systems, you have $1"
         Quit
       ${EndIf}
    ${EndIf}
  ${EndIf}
!macroend
.