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It's an AI file, so vector and should be able to scale to any size. I'm not sure I understand the issue.
Looks like a Mod moved your question to the correct forum for you.
You don't enlarge it in Photoshop, It's an Illustrator file. Enlarge it in Illustrator to the side you need and save as a jpg or png.
I have just downloaded and tried that file. Actually I can confirm int is a faulty image. I am sure they will likely refund you a credit. Very bad image file.
I apologize for the trouble. I will be adding a credit to your account so that you can use the license.
Thanks Brad for confirming.