Why is KRNL marked as a vir*s?
it is because of misconception, windows defender thinks (.dll) extensions file is vir*s. it is nothing more then misconceptions.
Is KRNL currently down?
krnl is one of the Best & All time uptime maintain software so, there is very less chance of down.
How do I get the latest version of Krnl?
You get Latest Version of Krnl by Simply Visiting (krnlwearedevs.com)
How do I fix Krnl error on Roblox?
must check you have installed list of software – .NET Framework, VC Redist x64, latest version of krnl.