In addition to trying a different cable, try to ensure you are using the USB port soldered to your motherboard (some PC might have a slightly complex hub within the PC feeding other USB ports).
Can you find the log see advice here Howto troubleshoot issues with the easy-installer.
You are using a supported model ?
https://doc.e.foundation/devices/herolte
Models Supported General.
SM-G930F
SM-G930FD
SM-G930S
SM-G930K
SM-G930L
SM-G930W8
Other models are not supported
However in https://doc.e.foundation/easy-installer only SM-G930F is listed.
You are not facing the difficulty of the OP in the stage https://doc.e.foundation/pages/enable-usb-debugging.html ?
Meanwhile there have been difficulties with Easy Installer recently. Please tell us the version of Easy Installer as shown in the top of the Easy Installer window.