Re: Updating BF4 from computer to computer, please help
You need to start the download for the patch and pause it. For this short moment it should display the normal download speed.
Then you have to rename the files you got from your friend. Everything that's in "Battlefield 4\Update\Patch". E.g. "cas_01.cas" to "cas_01.cas_DiP_STAGED".
Copy the renamed files into your "Update\Patch" folder.
Resume the download and it should immediately display 95% or so. You have to download only the 5% with normal speed.
Then you can do the same for China Rising. The files are in "Battlefield 4\Update\Xpack1". Here you don't have to download additional files. Everything is in the Xpack1 folder.