1. Currently, no debug mode option for spacedesk. We only send instructions to the users on how to get spacedesk debug logs if we need it for further analysis.
Are both primary and secondary machine connected on wireless network?
Please make sure your stable network connection between your primary and secondary machine.
You can also enabled the "Auto-reconnect" option on spacedesk Viewer app settings so it will auto-reconnect to the server when it suddenly disconnected.
2. After expiry date (31 August 2021), either a new free BETA (with extended expiry date) will become available or In-App-Purchases will be available in the App-Stores (Windows, iOS, Android) for small scale users (business and private).
The pay version / In-App-Purchase will contain the full feature set. It will probably range around € 10,- per client.
There will probably still be a free basic version (with limited features) for both small scale business and private users in the future.