Hi,
Yes this should be possible with our plugin. Here is how the setup might look like:
In the plugin’s settings General tab you would, Amount Limits as Maximum and Amount types as Quantity.
Then in the products tab of the plugin’s settings you would enable the Per product category option.
Then you would edit the Online Classes Category and set the maximum limit as 1.
However, this would be a lifetime limit of maximum 1 class per user.
If you would like to set the maximum limit to 1 for a certain time period in that case our plugin, Maximum Products per User might be better suited.