Follow any instructions given by your web browser. One or more additional steps are usually necessary to approve the software download and installation.
After installation, if you have never installed AlternaTIFF on your computer before, you will need to register AlternaTIFF. In that case, you will see the message "TIFF viewer not registered. Click here to register." at the top of this page. Click where it says to, and follow the instructions.
When you see the message "the AlternaTIFF ActiveX control is installed in your browser" at the top of this page, you're done. You can visit our test page to verify that everything is working.