Here is the official guide to update KT200/KTM200/ECUTuner ecu programmer software.
KT200 will prompt new version available when there is a new version. Press OK and follow steps below to run an upgrade.
Download the latest patch and dfb2xx.ll here
https://mega.nz/file/Mbs3XBwY#Ia3erk1QfYFLk5P8fO9JlU3rHBK5fE2Smo2oXGuG0Zo
Unexact zip file
Load and install the Patch
Copy dfb2xx.dll to replace the specified folder file
Copy and paste dfb2xx.dll to C:/KT200-master/DFBTech_Driver/i386 folder
If your system is 32bit, copy and paste dfb2xx.dll to C:/Windows/System32 folder
If your system is 64bit, copy the dfb2xx.dll file to C:/Windows/SysWOW64 folder
Then run KT200 software again.
Update KT200 software finished. New version software is ready to use.