Ok if I get the key at 30.00 dollars now. Will have pay an additional 30.00 when Sentinel is updated ?
Asked and answered a dozen times. You should read the 500-page thread.
$30 now (and wait for Sentinel updates)
OR
$60 when Sentinel updates come out.
Essentially, you are getting a discount if you get it now because you pay $30 once (now, w/o Sentinel support currently available) versus $60 once (when Sentinel support is available). If you buy now for $30, you still get access to Sentinel when it's updated. There is no charge for Sentinel and never has been.
Mike