How To Fix WP Super Cache Homepage Downloading As File

Problem

When I view my WordPress website in my browser, the page downloads and not displays.

Viewing your homepage results in a file being downloaded to your device.

Disable file compression in WP Super Cache settings.

Login to your WordPress website.
Click Settings > WP Super Cache.
Click Advanced tab.
Uncheck “Compress pages so they’re served more quickly to visitors. (Recommended).
Click Update Status