How do I resolve the error Publish-PSArtifactUtility : Failed to generate the compressed file for script when using Publish-Script?

I'm trying to publish a PowerShell script to PSGallery and I have successfully published PowerShell modules in the past, so my API key works (even tried renewing it).

Publish-Script -Path .\MyScript.ps1 -NuGetApiKey $ENV:MyKey

Publish-PSArtifactUtility : Failed to generate the compressed file for script 
'Attempting to build package from 'MyScript.nuspec'.'.  
At C:\Program Files\WindowsPowerShell\Modules\PowerShellGet\1.0.0.1\PSModule.psm1:2875
char:17
+ ...               Publish-PSArtifactUtility -PSScriptInfo $PSScriptInfo `
+                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [Write-Error], WriteErrorException
    + FullyQualifiedErrorId : FailedToCreateCompressedScript,Publish-PSArtifactUtility

Using -Verbose output will provide some additional information...

An error occured while trying to parse the value '' of property 'dependencies' in
the manifest file.
  '' is not a valid version string.

So clearly some value is missing during the compression process in the generated MyScript.nuspec file.

I've added the following ScriptInfo parameters before trying to publish the script.

param = @{
  Path = '.\MyScript.ps1'
  Version = '1.0.0'
  Author = 'Dennis'
  Description = 'My Script'
  ProjectUri = 'https://github.com/XXXXXX/MyScript'
  RequiredModules = 'PSWindowsUpdate',
    @{ModuleName='Pester';ModuleVersion='4.10.1'},
   'PendingReboot',
   'SpeculationControl'
}
Update-ScriptFileInfo @param -Force

(Tags are strongly recommeded but not a requirement.)

I've tried updating nuget.exe as Administrator as found here

Resolving Publish-PSArtifactUtility : Failed to generate the compressed file for script ‘C:\Program Files\dotnet\dotnet.exe failed to pack: error

Invoke-WebRequest `
  -Uri https://dist.nuget.org/win-x86-commandline/latest/nuget.exe `
  -OutFile "$env:LOCALAPPDATA\Microsoft\Windows\PowerShell\PowerShellGet\NuGet.exe"

I've probably missed something really simple, but can't figure out what...

Solution

According to MS Suppport PowerShellGet in Windows PowerShell 5.1 is no longer supported with PS Gallery.

So I needed to install the latest version of PowerShellGet.

MS Learn - Update PowerShellGet for Windows PowerShell 5.1

So the solution would be to run this as Admin

Invoke-WebRequest `
  -Uri https://dist.nuget.org/win-x86-commandline/latest/nuget.exe `
  -OutFile "$env:LOCALAPPDATA\Microsoft\Windows\PowerShell\PowerShellGet\NuGet.exe"

Install-PackageProvider -Name NuGet -Force

Install-Module PowerShellGet -AllowClobber -Force

(The manual nuget download might be redundant, I haven't checked.)

and then restart the PowerShell console.