The only way to get Illustrator files as .jpg is to have someone with Illustrator convert them for you.
Thanks Brad. As I'm so new here... do you know how I send an email to Adobe Stock directly? Seems I've signed up without knowing this, and now my membership isn't useful to me. Thank you!
Not all images are .ai files on Adobe Stock. When you do a search uncheck the box that says 'Vectors' and 'Videos' and you will only get .jpgs. if that helps.
There is no direct email, you would need to use the support channels on the Adobe site. Another couple ways to do it would be to:
1: Start a new thread here with 'Cancel Subscription' in the title so a staff member has a better chance of seeing it
2: If you use twitter, the best way to contact support for account related issues is to send a tweet to @AdobeCare
But once again, unchecking the Vector checkbox on the search will prevent you from getting .ai files.