Lein Windows Security Error

error.txt

>lein self-install
Downloading Leiningen now...
Exception calling "DownloadFile" with "2" argument(s): "The request was
aborted: Could not create SSL/TLS secure channel."
At line:1 char:145
+ ... che]::DefaultNetworkCredentials; $client.DownloadFile($a, $f)} "https ...
+                                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : WebException


Failed to download https://github.com/technomancy/leiningen/releases/download/2.8.1/leiningen-2.8.1-standalone.zip

It is possible that the download failed due to "powershell",
"curl" or "wget"'s inability to retrieve GitHub's security certificate.
The suggestions below do not check certificates, so use this only if
you understand the security implications of not doing so.

The PowerShell failed to download the latest Leiningen version.
Try to use "curl" or "wget" to download Leiningen by setting up
the HTTP_CLIENT environment variable with one of the following
values:

  a) set HTTP_CLIENT=wget --no-check-certificate -O
  b) set HTTP_CLIENT=curl -f -L -k -o

NOTE: Make sure to *not* add double quotes when setting the value
      of HTTP_CLIENT

lein.diff

--- lein.bat.original   2018-04-09 11:27:07.549354500 +0100
+++ lein.bat    2018-04-09 11:28:43.442263400 +0100
@@ -154,7 +154,7 @@
 call powershell -? >nul 2>&1
 if NOT ERRORLEVEL 0 goto TRY_WGET
     set LAST_HTTP_CLIENT=powershell
-    powershell -Command "& {param($a,$f) $client = New-Object System.Net.WebClient;  $client.Proxy.Credentials =[System.Net.CredentialCache]::DefaultNetworkCredentials; $client.DownloadFile($a, $f)}" ""%2"" ""%1""
+    powershell -Command "& {param($a,$f) $client = New-Object System.Net.WebClient; [Net.ServicePointManager]::SecurityProtocol = 'tls12' ; $client.Proxy.Credentials =[System.Net.CredentialCache]::DefaultNetworkCredentials; $client.DownloadFile($a, $f)}" ""%2"" ""%1""
     SET RC=%ERRORLEVEL%
     goto EXITRC