CS5 was released in 2010. It was designed for the operating systems of that era (Windows 7, early OS X). Running a cracked portable version on Windows 10 or 11 is a gamble. You won't receive bug fixes, and if it crashes your system, Adobe support won't help you.
Yes, it costs money. But for professionals, it is a business expense. You get:
Adobe actively monitors piracy. Using a portable, cracked version violates the Adobe Software License Agreement. While individual users are rarely sued, businesses face: Adobe Illustrator CS5 portable
The number one risk is malware. Repacked portable software is a favorite vector for cybercriminals.
When you download "Adobe Illustrator CS5 portable.rar" from an unverified source, you are likely getting more than you bargained for: CS5 was released in 2010
Real-world case: In 2023, security researchers at RedCanary identified a widespread trojan disguised as "Adobe Illustrator Portable" that deployed a backdoor known as Suspicious.ByteStor. It stole browser cookies and session tokens for social media accounts.
Even if the file scans clean on VirusTotal today, repackers frequently add delayed payloads that activate weeks after installation. Real-world case: In 2023, security researchers at RedCanary
Adobe offers a free version of Illustrator on the iPad and a web version. While it doesn't have every feature of the desktop classic, it is legitimate, free to start, and great for doodles and basic vector work.