Error downloading files with DownloadFile in powershell 2 - powershell

Question

I have the need to download files under powershell 2.
Since Invoke-WebRequest is not supported in version 2, I try to use DownloadFile but I always get the same error and I don't know how to fix it.
PS C:\Users\user> [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
:: : Exception setting "SecurityProtocol": "Cannot convert null to type "System.Net.SecurityProtocolType" due to invali
d enumeration values. Specify one of the following enumeration values and try again. The possible enumeration values ar
e "Ssl3, Tls"."
At line:1 char:28
+ [Net.ServicePointManager]:: <<<< SecurityProtocol = [Net.SecurityProtocolType]::Tls12
+ CategoryInfo : InvalidOperation: (:) [], RuntimeException
+ FullyQualifiedErrorId : PropertyAssignmentException
PS C:\Users\user> $client = new-object System.Net.WebClient
PS C:\Users\user> $client.DownloadFile("https://web.com/test.txt", "C:\Users\user\Desktop\test.txt")
DownloadFile : Exception calling "DownloadFile" with "2" argument(s): "The underlying connection was closed: An unexpec
ted error occurred on a send."
At line:1 char:21
+ $client.DownloadFile <<<< ("https://web.com/test.txt", "C:\Users\user\Desktop\test.txt")
+ CategoryInfo : NotSpecified: (:) [], MethodInvocationException
+ FullyQualifiedErrorId : DotNetMethodException
What I can do?

Answer 1

If you are getting an error setting the TLS version, you may want to check which protocols are available:
[Net.SecurityProtocolType]::GetValues( 'Net.SecurityProtocolType' )
However, I don't know how the protocol availability will be affected by using such an old version. Moreover, I don't know how specific protocol settings on a given system affect the availability of protocols either at large or as returned by the above command.
In fact, I would point out the error itself only reflects SSL3 & Tls. On my system when I enter an invalid enumerator the error reports Ssl3,Tls,Tls11,Tls12,Tls13 as choices. While my system is configured to disable everything below Tls12 and has no settings defined for Tls13.
The best assumption I can make is .Net 2.0 which is used with PowerShell 2.0 cannot use Tls12 as it's not present in the enumerators and based on comparison with my system the enums aren't affected by explicit enabling/disabling of protocols.
In any case, I think you have to clear up the first error before you worry about the second. The second error may well be due to the TLS incompatibility. The easiest way to do this would be to upgrade PowerShell (along with the required .Net version). PowerShell 2.0 can coexist with Windows PowerShell 5.1 though you may have to launch with the -Version 2.0 parameter. Also, make sure the engine is installed as a Windows feature. DISCLAIMER: verify all that on your own.
I know the Windows PowerShell 2.0 Engine (PowerShell-V2) was available as a feature at least as late as Windows 2012 R2.
I would also point out that PowerShell 7.x (aka PowerShell Core) can be installed side by side with Windows PowerShell. Potentially this could sidestep the aforementioned complications, allowing you to do run the task at hand...