laut der 12.0.2 Hilfe ist es korrekt.
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The cascaded MUI installer was introduced in V12.0 and is supported for the Notes Standard client on Windows. For more information, see Using the cascaded Multilingual User Interface (MUI) pack installer (Windows). Silent install of the cascaded MUI pack is supported as of V12.0.1.
It's important to note the addition of the tilde (~) character to replace the double quote (") character, a difference from silent install for a regular Notes kit. Regular kits use the syntax -s -a /s /v"" while the cascaded MUI installer uses -s -a /s /v"~~".
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Mit der 32bit Version vom MUI Pack 12.0.2 funktioniert es ja auch. Nur mit der 64bit Version von 12.0.2 nicht.