The MSSQL installer does not go through - it's missing .NET 3.5 framework to complete.
Unfortunately I've been unable to solve this, what I've tried:
Manually download and transfer the /sxs folder(which should contain the driver) to the C: drive, hereafter running this command in powershell(with admin rights):
install-windowsfeature -name NET-Framework-Core -source c:\sxs - It does indeed move on to install it, but gets stuck at 68%.
I've also tried downloading and transferring the .NET 3.5 installer itself from Microsoft, and going through the official way of installing it (Server Manager). Same thing applies - it gets stuck roughly 68% into the process, and hereafter just informs that the service-feature could not be installed.
Quite out of options. Help appreciated.