Here are the steps to register an adapter manually:

1. Export the registration of the adapter:

In the computer where the adapter is already defined, open the register editor (Start -> Run -> regedit) and look for the entry of the adapter under HKEY_CLASSES_ROOT\CLSID.

The easiest way is to find the entry (Edit/Find) is using the name of the adapter: For example ATTU_myAdapter.

The entry has to keys: BizTalk and "Implemented Categories"

Export the full entry defining it (its name is an CLSID number, for example {7ef69c17-7dce-4705-bed5-800ee175a9fe}) into a file (by default, its extension will be "reg").

2. Copy the adapter DLL into the product installation directory in the target computer.

3. Change the location of the assembly files in the exported file, with the full path of the installation directory.

Open the exported file with a text editor (notepad is enough), and change the location of the assembly paths:

For example, in entries like these:

"AdapterMgmtAssemblyPath"="D:\\Program Files\\Attunity\\Attunity Adapter Suite for BizTalk Server 2004 1.X.0\\ATTU_queryAssembly_3.dll"
"OutboundAssemblyPath"="D:\\Program Files\\Attunity\\Attunity Adapter Suite for BizTalk Server 2004 1.X.0\\ATTU_queryAssembly_3.dll"
"InboundAssemblyPath"="D:\\Program Files\\Attunity\\Attunity Adapter Suite for BizTalk Server 2004 1.X.0\\ATTU_queryAssembly_3.dll"

Note that the "\\" is used to separate the folder names.
The InboundAssemblyPath will not exist if the adapter only supports send ports.
4. Import the registry file into the windows registry of the target computer.

The adapter should be defined in the target computer and you can define ports using it, or import a biztalk application