I have created a Slack Workspace to allow for a more collaborative and interactive method of sharing content as well as running the live training sessions from (fear not these will still be streamed via Twitch as well as being recorded and placed onto YouTube). The Slack Workspace is available at https://appsectraining.slack.com.
Since Slack only allows for an invite URL to only be valid for 29 days, I will need to find a better way of making this as open as possible. In the meantime the current URL which you can use to join the Workspace is: https://join.slack.com/t/appsectraining/shared_invite/enQtNjA4OTkzNzQ4NjkwLTIzMDNiYTAyZWY5YmZhY2Y4YTYzYTU1MWM2MGUxMjhkMjM4OWQ4ZjQ5OTgyZTc0NmEwNmNjYmZhYmU3NzcwMmM
If this does not work for you, please send me an email on the email [email protected], or DM me on Twitter (@SeanWrightSec).