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Copied unzipped directory to c:\Shortened its name to "en.st-stm32cubeide_1.2.0"Shortened the exe name to "st-stm32cubeide.exe"Installer started
While unzip the software by 7-zip, the "NSIS ERROR" occured,but use the WINDOWS default unzip software, i could run the install progress.
Your idea was correct, the issue came from the path. In my case it was D:\Téléchargement\STM32CubeIDE