The software interface is friendly used, can run in Windows XP / 7 / 8 / 8.1 /10.

There are following factors which may lead to a short remote range:
1. The power of the transmitter / remote has drained off and too low. You can replace the battery to try.
2. The frequency of either the transmitters or receivers has shifted, you need to send back the unit to the factory to fix the problem.
3. The sensitivity of the receiver is too poor. The same you need to send back to the factory to fix.

1. You need to use 6LR61 9V batteries for the modules, and the fresh ones are better. If you use Zinc-C batteries, the Zinc-C batteries can only flow weak currents which can't fire the wires.
2. The Nichrome Wires should be slim and short.

Comparing with most of other Chinese companies, RFRemotech is entirely different.The owner of the company thinks the business is given by God, and honesty and integrity are very important, for he is a convinced Christian. Don't worry of your money.

You can just run the software as administrator like below:

Move your mouse on the RFRemotech icon and right click it to find the option “Run as Administrator” , then open the saved file, the music will be there.

You were using an older version TCF200-U, it is not compatible with the combined melody which was made by the latest Melody Combiner software. You can use this elder version of Melody Combiner Software:
MelodyCombinerV2.2.2.zip