Esp8266 ota port not available on Arduino ide

Hi. I have been successful in having Arduino ota working on my win 10 laptop but on my win7 desktop is not. I have python installed on both, I reinstalled the esp8266 definitions but without luck. What could I check to understand what is wrong on my desktop? I haven't fully understood how the ota port is discovered by the IDE and that it is preventing me from finding the cause