how do i download and install patches & deliver troops to area when asked?
 

i have pursched silent hunter 4 from steam and it came with v 1.3 i want to download the yammato bb for 1.5 but i dont know how to update my silent hunter



and also i have a problem with patrols how i deliver special troops to thier designation.?

SH4 1.5 is a full upgrade you have to pay for. You can find it by googling 'SH5 U-Boat Missions', but the easiest way to guarantee the full upgrade is to buy 'SH4 Gold'.