Version 3.11 requires a valid license. If you own an older i1 device (like the original i1Pro), this version may not support it. Check the hardware compatibility list before upgrading.
According to the official release notes from X-Rite (archived in late 2023 through 2024), here is what the "new" version brings to the table: i1profiler 311 download new
If you specifically need v3.1.1 for older hardware, it is typically found in the "Archive" or "Previous Versions" section of the X-Rite Support Center . Version 3
If you are still running version 3.0 or 3.0.5, you are missing out on stability improvements. Here is what version 3.11 specifically addresses: i1profiler 311 download new