Version 1.2.1 is not the latest release (Schneider has moved to Vijeo Designer 6.x and newer), but it is a stable, widely used build from a specific era. Users seek this version because:
Click the download button. You may be prompted to log in. Provide your email and password.
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You can try this search in Google: "Vijeo Designer Basic 1.2.1" filetype:exe site:schneider-electric.com
Access the "Software and Firmware" section under the product support page. vijeo designer basic 1.2.1 download
If you cannot find version 1.2.1 or are open to modernizing:
The software is designed for industrial PC platforms with the following minimum specifications: Version 1
Schneider Electric no longer actively promotes version 1.2.1 on its front page, but it through their official legacy software archives. However, you will not find it on third-party “free software” download sites—and you should avoid those due to malware risks.
If the software is no longer listed on the public facing download site (as vendors often remove very old versions to encourage adoption of new platforms), contacting an authorized distributor is the next best step. Distributors often have access to "Partner Portal" archives where legacy files like version 1.2.1 are stored for maintenance contracts. Provide your email and password