Adapt package description for the new msi installer

packages/putty.xml

@@ -12,14 +12,11 @@
  
         <check type="uninstall" condition="versiongreaterorequal" path="PuTTY release %PKG_VERSION%" value="%PKG_VERSION%"/>
  
-        <install cmd='%SOFTWARE%\putty\putty-%PKG_VERSION%-installer.exe /sp- /verysilent' />
+        <install cmd='msiexec /qn /norestart /i "%SOFTWARE%\putty\putty-%PKG_VERSION%-installer.msi"' />
  
-        <upgrade cmd='%SOFTWARE%\putty\putty-%PKG_VERSION%-installer.exe /sp- /verysilent' />
+        <upgrade include='install' />
+        <downgrade include='install' />
  
-        <remove cmd='%COMSPEC% /c copy "%SYSTEMROOT%\system32\print.exe" "%INSTALL_PATH%\putty.exe"' />
-        <remove cmd='"%INSTALL_PATH%\unins000.exe" /sp- /verysilent /norestart' >
-          <exit code="1" />
-        </remove>
-        <remove cmd='%COMSPEC% /c rmdir /s /q "%INSTALL_PATH%"' />
+        <remove cmd='msiexec /qn /norestart /x "%SOFTWARE%\putty\putty-%PKG_VERSION%-installer.msi"' />
       </package>
 </packages>