Windows 10
1. Right-click on any .pdf file that you have saved. Click on "Properties" at the bottom of the menu that pops up.
2. After the properties window opens, click on the "Change" button to bring up a list of programs.
3. Windows will ask you to choose the default program for opening .pdf files. Select the version of Adobe Acrobat that you have installed then click the OK button.
4. Back in the Properties window click the OK button to save the changes.
PDF files will now open in Adobe Acrobat by default when you click on them.
MacOS
1. Ctrl + Click on any .pdf file that you have saved. From the menu that pops up click on "Get Info".
2. A window will pop up displaying information about the file. Click on the "Open with:" tab to expand it.
3. In the "Open with:" tab click on the selection box to bring up a list of applications.
4. From the drop-down list select the version of Adobe Acrobat that you have installed.
5. After selecting Adobe Acrobat click on the "Change All..." button to set Adobe Acrobat as the default application for opening .pdf files.
6. A confirmation box will open to confirm the changes. Click the "Continue" button to confirm.
PDF files will now open in Adobe Acrobat by default when you click on them.