In your Creative Cloud settings, ensure "Show Older Apps" is checked to see if v26 is still available for your account.
If it’s missing and you have a specific technical need (like hardware compatibility), reaching out to Adobe Support is the only secure way to request an older installer. In your Creative Cloud settings, ensure "Show Older
If you're on a budget, consider the Illustrator for iPad version included in many plans, or look for student and teacher discounts on the official Adobe site to save up to 60%. In your Creative Cloud settings