This is a script increases the template size from the default of 50mb to 500 MBs for sharePoint
Add-PSSnapin Microsoft.SharePoint.Powershell -ErrorAction SilentlyContinue
$webservice = [Microsoft.SharePoint.Administration.SPWebService]::ContentService
#Get the current Maximum Size
$webservice.MaxTemplateDocumentSize
#Set New Limit and update
$webservice.MaxTemplateDocumentSize = 524288000 #500 MB
$webservice.Update()