Hey guys, I found the solution fo my problem with TIA UPDATER V15.1:

It was necessary to download and install manually only this update 4: 

https://support.industry.siemens.com/cs/cn/en/view/109763890 

After this, all the other applications were been found at the Tia Updater searching, as you can see:

Dear;

I had your same problem in TIA V15 ,but I done bellow procedure and now it's working:

1- turn off windows firewall

2- disable or removed anti virus

3- update your windows to newer version

4- in windows Firewall with advanced security Inbound Rules you should enable

" Totally Integrated Automation UPDATER"

best regards

Dears;

In bellow link you find  TIA update (UP1...UP4)

https://support.industry.siemens.com/cs/ww/en/view/109755826

I hope useful for you

best regards

How to fix TIA updater _ TIA administrator:

 Hi, 

I try today also with my older PG, where I have installed all older versions of STEP7.

It's the same story. If i'm not connected to the VPN, I get the error: Unable to connect to the server. 

And with VPN connected it works. 

Regards

0_Einstein

That is very interesting.  I unfortunately do not have an option to install a VPN for work-related internet activities.  One is already integrated and automatically runs when away from the office.

I cannot even use this solution if I were physically *in* Germany!  It would show up as if I were in the office even if I was connected from within eyesight of Siemens HQ.

Rusbi

Hello,
I tried practically everything that was written on the forum. Nothing worked.Then I tried to change the internet access, via VPN, I changed my IP to German, and UPDATER start to work. 

After that I disconnect the VPN from Germany, and try again to search the updates, and guess what: It didn't work. 

I change back to the German VPN IP and updater find all necessary updates - and I didn't start it as Administrator.

Strange, but for me works. 

Regards