I am using Visual Studio 2017 and trying to create a "console application (.Net standard)." This is no longer on the list of available projects when I do "File → New Project ..."

He was there a few minutes ago. It disappeared after creating the “Console Application (.Net Core)” and then uninstalled this application because I realized that I really want a standard application.
I deleted it by removing it from Visual Studio, then going to the file system and deleting it.
I tried running the installer and updating the 2017 installation. This did not help.
How can I get the "Console Application (.Net Standard)" available as the type of project to create?
[EDIT] I disabled and restarted visual studio.
[EDIT] devenv /installvstemplates, devenv . : C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\IDE. ? [ - ?]
[EDIT] : "C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\IDE\devenv.exe" /installvstemplates The operation could not be completed. The requested operation requires elevation..
[EDIT] : runas /user:Administrator "C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\IDE\devenv.exe" /installvstemplates RUNAS.
[EDIT] powershell :
PS C:\Windows\system32> 'C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\IDE\devenv' /installvstemplates
At line:1 char:75
+ ... iles (x86)\Microsoft Visual Studio 14.0\Common7\IDE\devenv' /installv ...
+ ~
You must provide a value expression following the '/' operator.
At line:1 char:75
+ ... \Microsoft Visual Studio 14.0\Common7\IDE\devenv' /installvstemplates
+ ~~~~~~~~~~~~~~~~~~
Unexpected token 'installvstemplates' in expression or statement.
+ CategoryInfo : ParserError: (:) [], ParentContainsErrorRecordException
+ FullyQualifiedErrorId : ExpectedValueExpression
[EDIT] , &. devenv.
[EDIT] , " (.Net Standard)" :