Tablo Exporter Not Working In macOS Big Sur?

Although it should still work, it doesn’t appear to have move out of alpha testing since 2017…

JettSoft Product Page

  • Note: These products are free, but are alpha or early beta.

Nor that is has been “tested” on current systems:
Tablo Exporter - Export Tablo Recordings

Currently testing on Windows 8 and Mac OSX.

You’ll likely get most support in the Tablo Exporter topic and @ the developer as they’ll get notified.