Some professionals legitimately keep an older version like CC 2018 (15.0.0) for compatibility with:
New tools for editing 360/VR video, including VR Comp Editor and VR functions. Adobe After Effects CC 2018 15.0.0 -Portable- X64 .rar
You lose access to critical security patches and bug fixes provided by Adobe Creative Cloud. Some professionals legitimately keep an older version like
This release featured GPU-accelerated motion blur and a visual keyboard shortcut editor to streamline the creative process. The "Portable" Distribution Phenomenon Adobe After Effects CC 2018 15.0.0 -Portable- X64 .rar