I installed FreeTelly https://www.tvaddons.ag/install-kodi/
After start, it invited me to finalize installation, but downloaded nothing resulting in error:
"Problem! Installation has failed. Restart and try again"

I fixed it by disabling system proxy. (i have software that redirect Windows, Internet connections via proxy), it can be also disabled in the Internet settings/Network. Google it

Another ideas to fix:

1. disabling firewall, antivirus
2. disable system proxy
3. Right click on the FreeTelly and select to run it as an administrator
4. Go to the Programs section and Click here to finalize installation.