blob_download.ps1

$StorageAccountName = "Storage Account Name"
$StorageAccountKey = "Storage Account Access Key"

$ContainerName = "Container Name"

$fileName = "Filtering file name"

$Context = New-AzureStorageContext -StorageAccountName $StorageAccountName -StorageAccountKey $StorageAccountKey

$Container = Get-AzureStorageContainer -Context $context -Name $ContainerName

$Blobs = Get-AzureStorageBlob -Container $Container.Name -Context $Context | Where-Object {
    $_.Name -eq $FileName
}

$Blobs | Get-AzureStorageBlobContent -Destination "./" -Context $Context -Force