I have fixed the issue but I don't know why,
After click on "Defaults", into the Thoraida Addons setings and click on "update", I can install transmission.
Kodi logs of the installation JYDG
22:05:39.542 T:4097667072 DEBUG: CAddonInstaller: installing 'service.thoradia' version '8.2.9' from repository 'service.thoradia'22:05:39.548 T:4097667072 DEBUG: Keyboard: scancode: 0x1c, sym: 0x000d, unicode: 0x0000, modifier: 0x022:05:39.568 T:4009747360 DEBUG: Unpacking zip://special%3a%2f%2fhome%2faddons%2fpackages%2fservice.thoradia-8.2.9.zip/service.thoradia/ to /storage/.kodi/addons/temp/55f49fff-f27e-4125-a92a-2e9dfc1b98df
looks like service.thoradia was downloaded, uninstalled and installed after click on update... but I already have 8.2.9 as you can see in my log from Friday. ¿why was updated if no new version was detected?
In any case that fix my issue.
Looking deeper on the logs form the other day,,,
but in the log from today I see...
See Thoradia Add-ons