Windows 10 LTSC gets updates until mid 2028 and if you use the IoT version 2032, both of which are full versions of Windows. And by all updates I mean security too. For free.

As for sailing the high seas, if you have the installers now for the software you are using, now would be a great time to see if they are available and back that stuff up or break down and purchase it. It is up to you.

Buy a key, download the ISO from the usual places, and install. Like doing a clean install of Windows 10. There are some desktop apps that it doesn’t have but you can download them and just use them or you can use third party apps. Most of the telemetry and adware isn’t installed and it actually costs less the ESU and will get updates until 2028/2032 for the IoT (Internet of Things) edition which uses the same key.

Good thing I went AMD on my LTSC build.