On Windows7 installing jabba failed

[EricJim08]

My system is Windows7 x64 SP1 version.

When trying to install jabba, enter the following command in the Power Shell:

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

Invoke-Expression (

Invoke-WebRequest https://github.com/shyiko/jabba/raw/master/install.ps1 -UseBasicParsing

).Content

But an error is reported:

PS C:\Windows\system32> [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
设置“SecurityProtocol”时发生异常:“由于枚举值无效，无法将空值转换为类型“System.Net.SecurityProtocolType”。请指定以
下枚举值之一，然后重试。可能的枚举值为“Ssl3、Tls”。”
所在位置 行:1 字符: 28
+ [Net.ServicePointManager]:: <<<< SecurityProtocol = [Net.SecurityProtocolType]::Tls12
    + CategoryInfo          : InvalidOperation: (:) [], RuntimeException
    + FullyQualifiedErrorId : PropertyAssignmentException

PS C:\Windows\system32> Invoke-Expression (
>>   Invoke-WebRequest https://github.com/shyiko/jabba/raw/master/install.ps1 -UseBasicParsing
>> ).Content

I thought it was the script execution policy, but I typed the "Set-ExecutionPolicy-Scope CurrentUser"command,

Then after the "ExecutionPolicy:" prompt, enter "RemoteSigned" hit enter and then press "Y."

After doing the above, I re-enter the command to install jabba, and the error occurs again, seemingly unsolved.

I have a question: Does jabba not support Windows or does it not support Windows7?