You are missing one of the subsequent .part files.

Ensure you have part1.rar , part2.rar , part3.rar (and so on) in the same folder . The extraction will fail if any parts are missing.

The best option, as it is the native software for .rar files. 7-Zip : A great free, open-source alternative. 2. Step-by-Step Extraction Process

Right-click GF041222-TR-1.33770-GG.part1.rar and select "Extract Here" or "Extract to [Folder Name]".