If you are inside, the GPS location might not be found. If happing outside, it could be because of a bad configuration of the systems settings.

Your easiest way is to upgrade windows normally and if you dislike all it’s bloated software, just install Atlas OS on top of it. It’s just a software that will go through your windows and debloat it as much as possible. Simple as that. Easier done than reinstalling windows for an LTSC version. I personally have a dual boot with a win 11 with Atlas OS specifically for the software I can’t install on Linux.

Or use vaultwarden to have the convenience of syncing your data to a personal server or computer and have passkeys.

Maybe take a look at FluidCalendar, I just found it but haven’t tested yet : https://github.com/dotnetfactory/fluid-calendar It’s still in early development but it may have what you need.

Alternatively, you can take a look at Baikal for CalDAV and CardDAV support : https://github.com/sabre-io/Baikal

If the file doesn’t exceed 2 GB, you can use this : https://lufi.ethibox.fr/ Files are encrypted and cannot be seen by the owner of the website and the share can only go up to 30 days. It is recommended by Framasoft, the ones behind peertube.