At the time of its release, Adobe Reader 8.1 required relatively modest hardware by modern standards: Intel Pentium III or equivalent. RAM: Minimum 256MB (512MB recommended).
The 8.1 update was primarily designed to modernize the Reader 8 family for then-new computing standards: adobe reader 8.1
Adobe Reader 8.1 was released in 2007 and has been "End of Life" (EOL) for many years. At the time of its release, Adobe Reader 8