Recommended method
Do like it said on 
https://oss.azurewebsites.net/forum/flashf...iguration.html on old pc, save the whatever.fbk on the removable drive and restore it on new pc.
However, if your having problems with following those instructions.....
This is a 
NOT recommended method.
To know exactly where files need to go, greatly depends on where you installed flashfxp, if it was a portable install or regular install.
1) Open FlashFXP on your old PC and Open Help>About>Details tab
2) Copy to clipboard and paste in a your reply here for more guidance.
For e.g mine is like this
	Code:
	FlashFXP version: 4.4.1 (build 1998)
Operating System: Windows 7 x64 Service Pack 1
Installation type: Per User - User data folder
Program folder  [Access: Read / Write]
C:\Program Files (x86)\FlashFXP 4\
Data folder  [Access: Read / Write]
C:\Users\username\AppData\Roaming\FlashFXP\4\
Shared data folder  [Access: Read / Write]
C:\ProgramData\FlashFXP\4\
Temp folder  [Access: Read / Write]
C:\Users\username\AppData\Local\Temp\
 So in my case Im looking at 
Data folder  [Access: Read / Write]
C:\Users\username\AppData\Roaming\FlashFXP\4\
And the files to copy to same path are something like this.
 
Hope this helps you.