Sorry to hear that you are facing troubles with Adobe Stock file.
Can you please let us know a few more details so that we can assist you further?
Infatti il file è in vettoriale
La dimensione che devo usare è cm.30x30 c/a
Il programma che uso è Correl draw X7
Ti allego screenschot dove puoi vedere nella parte in alto a dx gli occhi sono pixelati/sgranati
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:
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.