.NET Core SDK is missing (Windows)

Hello,

I'm having a weird issue. I have .NET Core installed in Rider and it was working until today. But after Rider hung up and I force-closed it, my .NET Core SDK is missing. I'm not sure if I had it installed or just the runtimes but everything had worked before.


Rider logs these errors:

Project 'MyProject' load failed
[MSB4236] The SDK 'Microsoft.NET.Sdk' specified could not be found.

Unable to locate .NET Core SDK: Check that .NET Core SDK is installed in 'C:\Program Files\dotnet'




And the SDK is not there:

C:\>dotnet --info
It was not possible to find any installed .NET Core SDKs
Did you mean to run .NET Core SDK commands? Install a .NET Core SDK from:
https://aka.ms/dotnet-download

Host (useful for support):
Version: 3.1.7
Commit: fcfdef8d6b

.NET Core SDKs installed:
No SDKs were found.

.NET Core runtimes installed:
Microsoft.AspNetCore.App 3.1.7 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 3.1.7 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]


My Rider setup:

JetBrains Rider 2020.2.1
Build #RD-202.6397.268, built on August 20, 2020
Runtime version: 11.0.7+10-b944.20 amd64
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o.
.NET Framework 4.0.30319.42000
Windows 10 10.0
GC: ParNew, ConcurrentMarkSweep
Memory: 1466M
Cores: 4
Registry: debugger.new.debug.tool.window.view=true, ide.tree.horizontal.default.autoscrolling=false, performance.watcher.sampling.interval.ms=200, ide.borderless.tab.caption.in.title=false, ide.tooltip.showAllSeverities=true, show.diff.preview.as.editor.tab=true, light.edit.file.open.enabled=false, performance.watcher.unresponsive.interval.ms=1000, search.everywhere.settings=true, show.diff.preview.as.editor.tab.with.single.click=true, parameter.info.max.visible.rows=10, ide.win.file.chooser.native=true, debugger.watches.in.variables=false, vcs.log.show.diff.preview.as.editor.tab=true, search.everywhere.pattern.checking=false, ide.tooltip.initialDelay=0, ide.require.transaction.for.model.changes=false, ide.debug.in.title=true, rdclient.asyncActions=false
Non-Bundled Plugins: cognitivecomplexity-rider, com.intellij.resharper.HeapAllocationsViewer, com.microsoft.vso.idea, com.intellij.resharper.azure