Example of editing the registry in PowerShell

Disable-IeHsts.ps1

#Requires -RunAsAdministrator
[CmdletBinding()]
param()

$ErrorActionPreference = "Stop"
Set-StrictMode -Version 5.0

# Not fully tested. Before you try this, try clearing IE's history and
# temporary files. EVERYTHING. That will probably do it for you.

# From https://support.microsoft.com/en-us/help/3071338/internet-explorer-11-adds-support-for-http-strict-transport-security-s

$key = "HKLM:\SOFTWARE\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_DISABLE_HSTS"
$property = "iexplore.exe"
$propType = "DWORD"
$value = 1

if (!(Test-Path $key)) {
    New-Item $key | Out-Null
}

Set-ItemProperty $key -Name $property -Value $value -Type $propType

if ([System.Environment]::Is64BitOperatingSystem) {

    # Need to do this for an additional x64-specific registry key

    $x64Key = "HKLM:\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_DISABLE_HSTS"

    if (!(Test-Path $x64Key)) {
        New-Item $x64Key | Out-Null
    }
    
    Set-ItemProperty $x64Key -Name $property -Value $value -Type $propType
}