Install and run Cisco TFTP Server on your PC
Then access to scisco switch (ssh) and you must now Ip address your PC running TFTP Server :
Mainswitch#copy run tftp Address or name of remote host []? 172.22.5.37 Destination filename [mainswitch-confg]? !! 29687 bytes copied in 4.228 secs (7022 bytes/sec) Mainswitch#