The emerged shortly after Adobe's major October 2018 release, which introduced significant updates across the Creative Cloud suite. This specific tool was designed to bypass the newer subscription verification systems Adobe implemented that year. Background: The 2019 Shift
Eligible users can save significantly—often up to 60%—on the All Apps plan through the Adobe Student and Teacher Legacy Version Access: Subscription holders can often download and install previous versions of Adobe software directly through the Creative Cloud Desktop App by selecting "Other Versions" under the app's settings. Adobe Help Center Update Creative Cloud apps manually - Adobe Help Center
The "Adobe CC 2019 AIO Patcher v1.5" is a relic of a specific era in the "cat-and-mouse" game between DRM developers and software pirates. While it was functionally effective for the CC 2019 suite, its utility has expired, and its danger level has increased.