Hello, the downloaded image file is for use on the computer, you can find another computer to download and use the image file.
You can prepare a USB drive when downloading the image, and choose to create a USB drive for another computer when downloading the image.
Sorry I don't have a real image file to describe here.
What you downloaded from this link is an .exe file, this .exe file should run on another computer that can be used, when you run it, and follow its instructions, you should make sure you are here An 8GB+ USB drive is plugged into the computer.
In the instructions of this program, there will be an option: "Create installation for another computer", select this option, then you can choose "Create USB drive"
You can check how your computer enters the BIOS. We can proceed to the next step only after knowing the method of entering the BIOS. Of course, it's best if you have someone around you who knows how to install the system, because any setting in the BIOS will affect your laptop.
Once the USB drive is created, plug the USB into your laptop, enter the BIOS, and set the boot options to USB boot.
Then follow the prompts to install.
One of the steps will let you choose whether to upgrade this computer or customize the installation, you should choose custom, and then choose to install on your C drive. This may require you to recall and calculate which is your C drive, because it won't say C or D on it, it will just write the disk number and its size.
Of course, I still recommend that you find someone who knows how to install the system to do the operation, these steps have the risk of losing files. We cannot guarantee that all your operations are correct in the dialogue mode of posting on the forum, so you can find someone who is good at computers to operate as much as possible. If it is a maintenance person, it may be better to protect your data.