Hi,
You can try running the Media Creation Tool as an administrator and temporarily disabling any antivirus or VPN before starting the download again, since these can sometimes block the process. Also, make sure your flash drive has enough free space (at least 8 GB) and is formatted as FAT32 or NTFS. If the issue continues, try downloading the ISO file directly to your PC instead of the USB drive, then use a separate tool like Rufus to create the bootable USB.
Have you already checked if your Windows version matches the edition you’re trying to download?
Kind regards,