Locast?

Where can I find the locast add-on?

Settings - Addon-Browser - All Repositories - Video Addons

Not there at all.

Well not sure if you also looked around as I had a small typo in above. But it is at:
Settings - Addon Browser - Install from repository - All Repositories - Video Addons

Screenshot from 2021-06-01 08-16-49

It is not there. Should be 'tween Livestreampro and Long Now Seminars