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1  I purchased 5 rt21 radio's and the disk to program them with the cable; but it does not work with windows 10. can you send me a link to the correct software?
Please download RT21 usb driver and RT21 software from Retevis official website: http://www.retevis.com/resources-center/ Attached a photo for you reference:
2  Hello Where can I download the programming software for the RT21 and RT81? Thanks and Greetings Stephan
A blog about how to program radios : http://blog.retevis.com/retevis-radio-frequency-programming/
3  Is there a way to get the radio to beep when you press the transmit button and when you receive call?
Hello Robert, RT21 radio hasn't beep function, so sorry for that, Thanks for your suggestion, we will update it Brgds
4  Hello I have RT21, is a good radio but i have problema. I can not programming this frequency 446.00625 446.01875 446.03125 Help
please confirm if you "write to radio'' in RT21 software, attached a pic for you reference
5  After the download the software for RT21 shows error message and can not be used. With RT1 and H777 everything is OK. Need a solution otherwise i have to return the equipment to the seller. Greeting Ralf
Any pictures to show the error ? Or you could try to program by Chirp -- http://chirp.danplanet.com/projects/chirp/wiki/Home