Is there a way to chnage a low res image to high res in Coral Draw X5 please ?
No , sorry.
You will never be able to add detail to a low res image, it just isn't possible. However you can make more of what you have. Have a look at the Skylum range of products which allow you to enhance detail and sharpen poor images. Free trials available.
That's true however in Photo-PAINT X5 (never Photoshop) a great image can doubled without the blur issue Photoshop gives you. I did it from version 8 through X7 until PhotoZoom was available.
Since 2019 I believe it's built into the suite, beware of the 30,000 pixel limit.