Windows 7 Cannot signin with iTunes - Unknown error -50

[gw1500se]

I need to access some legacy apps for my iPhone 5 (IOS 10). I read where to do that I need to install iTunes version 12.6.3, which I have done. However, when I try to sign-in I get an error -50. It says this is temporary but it really is permanent. I am able to sign-in from the web as well as from my iPhone using the same credentials. Can someone help me debug this? TIA

 

[Neemobeer]

You'll need to install version 12.6.5.3

 

[gw1500se]

Thanks for the reply but iTunes update tells me I have the latest. When I look, the old versions jump from 12.6.3 to 12.7. Where can I find that version?

 

[Neemobeer]

can't authorize my computer error -50… - Apple Community

 

[gw1500se]

That was it. Thanks much.