Did you look for/find/read 2221815 - SAPscript Legacy Text Editor controls are not packed in SAP Windows GUI Installation?
Solution
The Installer for SAPscript Legacy Text Editor can be downloaded from SAP Software
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-> SAPSCRIPT LEGACY TEXT EDITOR
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The downloaded 'SAPSCRIPT LEGACY TEXT EDITOR' should be installed additionally on SAP Windows GUI 7.40 Patch 5 Compilation 2 and higher.
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Regards,
Raymond