Can't mount disc image file, "The Disc Image File is Corrupted"
It's simple - you chose the wrong recovery -the one you linked to is for Huawei P9 lite

Your device doesn't have an official TWRP but has a unofficial TWRP linked here

TWRP meant for one device model cannot be used for another. Period

That's exactly what the other answer was saying.

Please take the trouble of reading the relevant forums in XDA to be aware of the device specific techniques.

Next, TWRP cannot be opened at C:/ of your computer

You need to set up adb (press on that to read the wiki. You don't need Android studio for this - it's meant for developers and occupies memory unnecessarily. Uninstall that and read the next paragraph carefully to install what is required for this purpose

To set up adb see instructions here Is there a minimal installation of ADB? and How to install adb

It is strongly recommended that you read and understand what you are doing with a rooted device (as you say you have rooted it). Consequences can be very very unpleasant and you could end up holding a paper weight instead of a phone