Did you ever license (pay for) an earlier version? If so, reinstall it. The install file may still be on your PC.
Unlicensed versions don't require sign-up, and export functions are crippled after the trial period. Some time back, one could attempt to uninstall the trial - via Windows Program and Features - and they would be presented with an option to use a free version, with limited export formats. That may no longer be the case, but you can take a look.
A reinstall may or may not enable some export formats. Here's a link to what is listed as the latest "free" version.
