I went to Guru Pro and I login to admin. I scroll down to support, then, video.
It is saying that those videos are not available.
Is this error message is due to the fact that my subscription expired or those videos actually are no longer available?
The Videos are older and not match with current Guru, they removed. the links will be removed in next updates.
Here is user guide you can follow : https://ijoomla.com/guru-user-guide#setup