Microsoft Windows

Method One (Adobe Reader versions 10+):

1. Open Adobe Reader from Start Menu 
2. Click Edit
3. Click Preferences
4. Select General
5. Click Default PDF Handler button
6. Choose Adobe Reader X or XI from list then click Apply
7. Click Yes on User Account Control prompt (if received)
8. Click OK on Preferences window
9. Close Adobe Reader

Note: If prompted, restart computer

Method One (Adobe Acrobat Reader DC):

1. Open Adobe Reader from Start Menu 
2. Click Edit
3. Click Preferences
4. Select General
5. Click Select As Default PDF Handler button
6. Choose Adobe Acrobat Reader DC from list then click Apply
7. Click Yes on User Account Control prompt (if received)
8. Select Continue
9. Click OK on Preferences window
10. Close Adobe Reader

Method Two

1. Save PDF file to computer
2. Locate saved file then right-click on it and select Properties
3. Click the Change button next to Opens With
4. Select Adobe Reader from the list (usually under Recommended Programs)
5. Click OK
6. Click OK on the Properties window
7. Double-click PDF file and verify it opens in Adobe Reader

Apple Macintosh

Method One (Adobe Reader versions 10+):

1. Open Adobe Reader from Applications list (GO > Applications > Adobe)
2. Click Adobe Reader > Preferences
3. Select General
4. Click Default PDF Handler button
5. Choose Adobe Reader X or XI from list then click Apply
6. Close Preferences window
7. Close Adobe Reader