Splashtop Business Access Solo plan ... $5 monthly, free 7-day trial
1. install Splashtop Business on visiting computer
2. install Splashtop Streamer on visited computer
3. sign up with email address
4. log into both programs with email and password
15-5: TeamViewer 15 Host Windows • 15.1.3937 ... Under Advanced > General advanced settings, set "Check for new version" to "Never" and set "Install new versions automatically" to "No automatic updates"..... One good reason to block updates: As of Feb 2022, the current version (15.26.4) requires creation of a TeamViewer account to set up unattended access. An account is free, but it's an unnecessary hurdle.
15-6: TeamViewer 15 Host Mac ... In settings, disable checking for new versions and disable automatic installation of new versions.