PS C:\Windows\system32> Install-Module PSSlack -Force
WARNING: Unable to download from URI 'https://go.microsoft.com/fwlink/?LinkID=627338&clcid=0x409' to ''.
WARNING: Unable to download the list of available providers. Check your internet connection.
PackageManagement\Install-PackageProvider : No match was found for the specified search criteria for the provider 'NuGet'. The package provider requires 
'PackageManagement' and 'Provider' tags. Please check if the specified package has the tags.
At C:\Program Files\WindowsPowerShell\Modules\PowerShellGet\1.0.0.1\PSModule.psm1:7405 char:21
+ ...     $null = PackageManagement\Install-PackageProvider -Name $script:N ...
+                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidArgument: (Microsoft.Power...PackageProvider:InstallPackageProvider) [Install-PackageProvider], Exception
    + FullyQualifiedErrorId : NoMatchFoundForProvider,Microsoft.PowerShell.PackageManagement.Cmdlets.InstallPackageProvider
 
PackageManagement\Import-PackageProvider : No match was found for the specified search criteria and provider name 'NuGet'. Try 'Get-PackageProvider -ListAvailable' to 
see if the provider exists on the system.
At C:\Program Files\WindowsPowerShell\Modules\PowerShellGet\1.0.0.1\PSModule.psm1:7411 char:21
+ ...     $null = PackageManagement\Import-PackageProvider -Name $script:Nu ...
+                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidData: (NuGet:String) [Import-PackageProvider], Exception
    + FullyQualifiedErrorId : NoMatchFoundForCriteria,Microsoft.PowerShell.PackageManagement.Cmdlets.ImportPackageProvider
 
WARNING: Unable to download from URI 'https://go.microsoft.com/fwlink/?LinkID=627338&clcid=0x409' to ''.
WARNING: Unable to download the list of available providers. Check your internet connection.
PackageManagement\Get-PackageProvider : Unable to find package provider 'NuGet'. It may not be imported yet. Try 'Get-PackageProvider -ListAvailable'.
At C:\Program Files\WindowsPowerShell\Modules\PowerShellGet\1.0.0.1\PSModule.psm1:7415 char:30
+ ... tProvider = PackageManagement\Get-PackageProvider -Name $script:NuGet ...
+                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (Microsoft.Power...PackageProvider:GetPackageProvider) [Get-PackageProvider], Exception
    + FullyQualifiedErrorId : UnknownProviderFromActivatedList,Microsoft.PowerShell.PackageManagement.Cmdlets.GetPackageProvider
 
Install-Module : NuGet provider is required to interact with NuGet-based repositories. Please ensure that '2.8.5.201' or newer version of NuGet provider is installed.
At line:1 char:1
+ Install-Module PSSlack -Force
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [Install-Module], InvalidOperationException
    + FullyQualifiedErrorId : CouldNotInstallNuGetProvider,Install-Module
    

PS C:\Windows\system32>  [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12


PS C:\Windows\system32>  Install-PackageProvider -Name NuGet

하기명령어 실행 후 설치 진행

[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12

Install-PackageProvider -Name NuGet