This usually means the download was interrupted. Try downloading the GTG.7z file again.
If you’ve just downloaded a file named GTG.7z , you’re likely looking at a high-compression archive containing game mods, custom maps, or software patches. Because .7z files offer superior compression ratios compared to standard ZIP files [19], they are a favorite for the gaming community to share large assets. GTG.7z
Choose . This creates a new folder so your desktop doesn't get cluttered with dozens of loose files. This usually means the download was interrupted