Force close the installer via Task Manager. Navigate into the BootCamp > Drivers > Realtek (or the specific vendor folder where it froze) and manually run the individual .msi or .exe installer files one by one.
Method 1: The Official and Safest Way to Download (Via macOS) Bootcamp Drivers Windows 10 64 Bit 6.0 6133 Download
You are using FAT32 format, which has a 4GB per-file limit. However, 1.2GB is fine. The real issue: Bootcamp 6.0.6133 extracts to ~2.1GB. Format your USB as exFAT or NTFS. Force close the installer via Task Manager