Paolo,
The vector images are best to be downloaded in Illustrator.
So I would request to download the file in Illustrator CC to get the best results and if you do not have Illustrator, then as a workaround you may download the trial version of Illustrator(7 days trial ) and can try to use the files.
You may use this link to download the trial version of Illustrator:
Download a free trial or buy Adobe products | Adobe free trials & downloads
You may also save the file as PDF as shown in the screenshot below and can use the file in CorelDraw:

If you still face troubles, feel free to update this thread so that we can further assist you.
Regards,
Twarita
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