Compared to modern software, the minimum requirements for After Effects CS3 are very low, making it a common choice for older hardware. Minimum Requirement
Adobe After Effects CS3 Professional remains a landmark release in the evolution of motion graphics and visual effects software. Released in 2007 as part of the Adobe Creative Suite 3, it introduced features that are still core to the software today, such as the Puppet Tool and Shape Layers. Key Features of After Effects CS3 Professional
CS3 introduced a feature called "Brainstorm," which allowed users to iterate on keyframe variations. By selecting properties and hitting the Brainstorm button, AE would generate random variations of those parameters, allowing the designer to "shop" for happy accidents. While newer tools like Cinema 4D’s Cloner systems or modern AI have superseded it, Brainstorm was an early attempt at generative creativity.
I really need to install CS3 [CS3 IS DEAD] - Adobe Community
Do not download "cracked" CS3 from YouTube descriptions or torrents. The psychological cost of cleaning ransomware off your family computer is far higher than the $20/month for the legitimate Creative Cloud student plan.
Adobe no longer sells CS3. However, if you find a sealed, physical box (DVD-ROM) from 2007, it contains a legitimate serial key. You can install this on older machines (Windows XP/Vista/7 or macOS Leopard/Snow Leopard). Adobe’s activation servers for CS3 were shut down in 2019. However, Adobe released a special "CS3 End of Life" workaround for paying customers who still have their keys.