As per official X-Rite Support , version 3.1.1 is primarily recommended for older environments:

Validates display performance against industry standards like ISO or IDEAlliance. Why Do Users Search for a "Repack"?

While the ⁠official X-Rite support page provides the original 3.1.1 installation, a "repack" might come from a community source.

A "repack" (or repacked version) is typically a modified installer created by third-party tech enthusiasts. It is designed to overcome limitations in the official installer.

Instead, download the legitimate 30-day trial from Calibrite. If you need longer access, save for a used i1Display Pro (often $150–200 on eBay) which includes a full software license. Your color accuracy—and your computer’s security—depend on it.

Select your installation language and destination.

Generate PDF reports showing deviation (DeltaE) before and after calibration. Useful for quality assurance in production environments.

Version 3.1.1 is particularly significant because it is the final version of the software that supports the i1Pro 1 (Revisions A through D)

Measures studio lighting conditions to automatically adjust monitor brightness.