(If you want, I can draft a short download-and-install step-by-step tailored to Windows 10/11 or provide checksum-checking commands for Windows PowerShell.)
How to Download and Use Grubinst-GUI for Easy Bootloader Installation grubinst-gui.exe download
: Provides a simple way to select the target disk and install the bootloader without typing complex commands. Google Groups Where to Download (If you want, I can draft a short