1. Find the Wireshark installation folder
2. Save the dissector BTSYNC.lua into the same folder as the file init.lua (this is usually the root wireshark install folder)
3. make a copy of init.lua as a backup
4. Edit init.lua and uncomment the line at the bottom for dtd_gen:
change:
--dofile(DATA_DIR.."dtd_gen.lua")
to
dofile(DATA_DIR.."BTSYNC.lua")

or add a new line: dofile(DATA_DIR.."BTSYNC.lua") but be aware that windows newline characters may break the file so use a linux compatible editor. ( such as Notepad++ )

Save init.lua
Start Wireshark and your dissector will be loaded at startup. 
Open a saved PCAP file or start a live capture. BTSYNC packets will be identified as BTSYNC as well as their classification
BTSYNC KEEPALIVE
BTSYNC ACK
BTSYNC GET_PEERS
BTSYNC TRACKER RESPONSE

for best results, go to :
View --> name resolution --> untick "enable for transport layer"

this will stop wireshark from automatically resolving ports to protocols (hbci/remoteware for 3000 , sos for 3838, DIS as UDP 3000 etc) until the next time you start wireshark or re-enable the option in the menu.
To disable transport layer all the time edit the application preferences.
