You can also test this program

https://github.com/joukoy/UniversalP...tcher-Full.Zip

It have integrated tinytuner database, and some of the dhp too, not quite sure if dhp files were released, but dhp database is not very good, and don`t have very accurate conversion, so you can safely skip it.
You can also log with the program, but not sure it will work with avt-841. There were some initial support but lack of avt-841device put it on the wait list. Give it a try and we can try to add it if not working and you can volunteer some debugging.