This will walk you through how to get 64 bit excel working and how to fix the issue where the integration stops working. 

First go to where the dll files are save should be something like this C:\User\"userName"\AppData\Roaming\Microsoft\AddIns

if you don't have the dll files they are attached at the bottom of this article make sure you grab the right ones for your excel and you will need to put them in this location C:\Users\"userName"\AppData\Roaming\Microsoft\AddIns

then rename the swiftxl9.dll to have a space before the 9 so like this swiftxl 9.dll.  

Then all we need to do is register the dlls using cmd.

Launch cmd in admin mode

the input   cd C:\Users\"userName"\AppData\Roaming\Microsoft\AddIns   then hit enter

then run this command   regsvr32 psconnector9.dll   

then finally this command    regsvr32 "swiftxl 9.dll"   

and that's all you need to do to fix the issue.