Andrzej,
There will be a offline HF available for this. You will need to open a support case to obtain it.
I suggest to you to evaluate the use of LUA and not apply downloaded HF's on the appliance. This way you are only getting BE HF's and not app...
The R4 iso that has BE15 is planned to be released 3rd of August. The HF to enable the upgrade will also be published to LiveUpdate on that day or just before.
The howto article for the upgrade will be when published be HOWTO111530
The HF that cont...