Adobe moved away from traditional serial numbers with the launch of CC (Creative Cloud). Modern versions use Adobe ID logins

Adobe has largely phased out serial number licensing for Creative Cloud apps as of October 2018. Most enterprise or volume serial numbers for these versions have since expired.

The simplest method is subscribing to Adobe Creative Cloud. For around $20–$55 per month (depending on discounts and region), you get the latest Illustrator version plus access to older versions through the Creative Cloud Desktop app. In the “Apps” section, under “Previous versions,” you can often install CC 2013 (17.x) as a legacy option. This requires an active subscription but keeps you legal and safe.

If you need access to Adobe Illustrator, here are legal alternatives:

and cloud-based licensing. Static serial numbers for CC 17.0.0 often won't work because the software tries to "call home" to verify the subscription. Stability Issues:

While Adobe Illustrator CC 17.0.0 was a revolutionary piece of software for its time, the era of the permanent serial number for Creative Cloud products has ended. For the best performance, security, and access to new tools like Generative Recolor and Global Edit, upgrading to the latest version via a legitimate Adobe ID is the recommended path for every designer.

Since Version 17.0.0 (released June 2013) is over a decade old, it may face compatibility issues with modern operating systems. Adobe now primarily uses a subscription model: Creative Cloud Subscription

Adobe Illustrator CC 17.0.0, released in June 2013, was a landmark version as it marked the transition from the perpetual "Creative Suite" (CS) model to the subscription-based (CC). Understanding Licensing for Version 17.0