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First make sure that you are trying to load the right firmware version. The 126.96.36.199.00 version is only if your camera has the Dual Pixel CMOS autofocus upgrade, either purchased that way or upgraded at our Factory Service Center.
If you have the standard C100 without the Dual Pixel AF upgrade, then make sure to select firmware version 188.8.131.52.00.
Download the appropriate file and make sure that you extract the file after downloading it. On a PC, you'll want to right-click the file and select EXTRACT. On a Mac, it will give you a file that looks like a white drive. Double click it and drag the .fim file inside onto your desktop.
You can then follow the instructions in the documentation that comes with the download.
When you load the .fim file onto your memory card using a card reader, make sure that the file goes into the root directory and not inside of any folders on the card.
If problems persist, please elaborate on what step is causing issues for you.
Uually this is the case if you pull the new firmware file directly from the compressed folder. In order to have a usable firmware update you need to unzip or extract the files from teh compressed folder and then move it into the root directory of the SD card after it has been formatted in the camera.
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Has your camera been upgraded with the Dual Pixel AF enhancement? If not, make sure that you are selecting version 184.108.40.206.00.
After you download the file, you should see a white drive icon. Double click it and then drag the .fim file to your desktop.
Then connect a card reader to your computer and then insert an SD card in it. Drag the .fim file directly onto the card reader icon, which should also look like a white drive.
Then make sure that the camera is plugged into a strong power source, and then try doing the update again.