Enable Side Loading of Apps

enable-sideloading.ps1

[System.Reflection.Assembly]::LoadFile("C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.dll")

$ctx = new-object Microsoft.SharePoint.Client.ClientContext("https://<site>")


$pass = "<password>"
$s = ConvertTo-SecureString -String $pass -AsPlainText -Force




$ctx.Credentials = new-object Microsoft.SharePoint.Client.SharePointOnlineCredentials("DemoAdmin@DelegateDemo01.onmicrosoft.com",$s)

$ctx.Load($ctx.Site);
$ctx.ExecuteQuery();
$guid = [System.Guid]"e374875e-06b6-11e0-b0fa-57f5dfd72085"
$ctx.Site.Features.Add($guid,$true,[Microsoft.SharePoint.Client.FeatureDefinitionScope]::None)
$ctx.ExecuteQuery();