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V15.1 can open older .STU files, but once saved in 15.1, they may not be backward compatible with older versions.

By using official software, you ensure that your production line remains secure, supported, and up-to-date with the latest IEC standards. i--- Control Expert 15.1 Download

If you need help finding the exact trial request page, let me know your country, and I can provide a direct Schneider Electric support link. V15.1 can open older .STU files

Schneider’s server uses Akamai download managers. If you use a download accelerator, disable it. Try using the "Schneider Electric Download Manager" plugin (offered on the download page). but once saved in 15.1