The installation part: if they have the PDF, they need a reader. Popular ones are Adobe Acrobat Reader, which can be downloaded from Adobe's site. Other options include Foxit Reader, SumatraPDF, or using built-in PDF viewers in browsers. On iOS or Android, apps like Adobe Acrobat Reader or Kindle (if buying from Amazon) can be used.
The installation part: if they have the PDF, they need a reader. Popular ones are Adobe Acrobat Reader, which can be downloaded from Adobe's site. Other options include Foxit Reader, SumatraPDF, or using built-in PDF viewers in browsers. On iOS or Android, apps like Adobe Acrobat Reader or Kindle (if buying from Amazon) can be used.