That sounds incredibly frustrating! Dealing with limited storage and constant updates is definitely a challenge, especially on devices like the Asus VivoStick with such constrained space. One method you might consider is using an external storage solution, like a USB drive or SD card, to offload some of the non-essential files or even redirect certain folders (like Downloads and Documents) to free up more internal space.
For handling Windows updates, you could look into setting your connection as metered. This approach can help limit the download and installation of updates as Windows tends to respect metered connections by not automatically downloading large update files. To set your Wi-Fi as metered, go to Settings > Network & Internet > Wi-Fi > Manage known networks, pick your network, then select Properties and turn on 'Set as metered connection'.
Additionally, using tools like Disk Cleanup regularly or third-party software to compress and remove stale Windows installation files might also reclaim significant space.
Lastly, if none of these work and manual policy adjustments haven't been effective in controlling updates on your VivoStick TS10, it could be worth exploring alternative lightweight operating systems that are less demanding on resources if your primary uses allow for that flexibility.
I hope some of these suggestions help alleviate the issue!