Once you have downloaded AcroPro_2015_Web_WW.exe and have your valid serial number ready, follow these steps:
Adobe Acrobat Pro DC (2015, Classic) — Overview and guidance Adobe Acrobat Pro Dc 2015 Classic Download
: A subscription-based model that received frequent updates with new features and service enhancements. System Requirements for 2015 Classic Once you have downloaded AcroPro_2015_Web_WW
Using 2015 Classic today leaves your computer vulnerable to modern PDF-based malware that has been patched in newer versions. Adobe Acrobat Pro Dc 2015 Classic Download
Adobe strongly suggests moving to the latest subscription-based Acrobat Pro