1) Uninstall the Block Sender by clicking the trash can icon.

trash

2) Confirm action by clicking Remove

remove-button

3) Reinstall the application. Go to http://www.blocksenderapp.com/ and click on the Install button.

Untitled

4) After you install, just go to your Google Chrome options on the top right hand corner

1menu-button

5) Then clicking on More Tools > Extensions.

2menu-list

6) Click on options on the Block Sender application.

chrome-extension-options

7) Type in your PayPal email and click Check License.

options-license1

8) Once the email is verified you will get this message.

license-ok