Maybe I found a solution, thanks to pinakolada's idea, but with a change.
I will update soon.
Thanks Enivid for your help, too.
!!! I think that I found a solution, to STOP META TRADER 4 AUTO UPDATE, and to DOWNGRADE FROM BUILD 1420, to BUILD 1415, or older, as you need, but to keep the Meta Trader 4, in a good functionality !!!
!!! It seems to WORK GREAT !!!
I will still check it, a few more days.
Not to have unpleasent surprises.
Thanks to pinakkolada user's idea, that told to me, to lock the entire MetaQuotes folder, but I did a CHANGE to this idea.
When I locked the entire MetaQuotes folder, it stoped the Meta Trader 4 Auto Update, but it also destroyed, almost all the functionality of the Meta Trader 4 terminal, almost nothing worked.
Then I decided to CHANGE a little this idea, after I read a few articles, on the Internet, how to stop, the Meta Trader 4 Auto Update.
The little CHANGE, was not to lock the entire MetaQuotes folder, but to LOCK the WebInstall folder, AFTER I DELETED the hole WebInstall folder, and created a new EMPTY WebInstall folder.
This is the procedure:
First check the Build of your Meta Trader 4, by the steps below:
Press your Meta Trader 4 Shortcut, to load it.
Press the Help Tab, and press About.
You will see, the Build of your Meta Trader 4, at the left - down, side, of the window.
The Build should be 1420.
Locate the WebInstall folder.
I have a VPS, with the Windows 2012 Server Operating System.
By me, the path of the WebInstall folder is below:
C:\Users\Administrator\AppData\Roaming\MetaQuotes\WebInstall .
If you don't find the WebInstall folder, in the path above, instead of in the folder "Administrator", maybe it will be, in the folder, with your computer's name.
DELETE this WebInstall folder.
Create a NEW EMPTY WebInstall folder, at the same place.
I tried to LOCK, this WebInstall folder, from my Windows Operating System, but it did NOT WORK.
Probably because it is not Windows Professional or Enterprise version.
Then I used an External Software, called "Wise Folder Hider", not in Windows.
You can use any other software, to lock a folder.
I think that this software is FREE.
Because I didn't see, any request to pay for it.
After you install "Wise Folder Hider", run it, by pressing it's Shortcut, on the Desktop.
You will get a message, to choose a password, and to write this password twice.
Then will open a window, and below, right, press the button "Hide Folder".
A File Explorer, will be opened.
Choose=Press, the WebInstall folder, as I wrote it's path, above, and press the button "OK", below.
This will make the WebInstall folder, Hiden=Locked.
If you want, you can also write a pasword, for this folder lock, by pressing the down arrow, at the right of the "Open" button, at the up - right, side, of the window.
But this folder lock password, is not necessary, to stop the Meta Trader 4 Auto Update.
Close the "Wise Folder Hider" window.
Download the 2 files below, of the Meta Trader 4 Build 1415, or an older Build, as you need:
1) terminal.exe .
2) metaeditor.exe .
Download the 2 files, from the Internet address below:
https://docs.google.com/spreadsheet...l9Ms16lTb7K/pubhtml?gid=515962633&single=true .
Copy the 2 files of Build 1415, terminal.exe and metaeditor.exe , to the folder of your broker.
The path of the folder, of my Broker, is below:
C:\Program Files (x86)\My Broker's Name .
Instead of "My Broker's Name", you should write, your Broker's name, or the path, where you installed the Meta Trader 4 Installation file, of your Broker.
After you copy the 2 files, you will get a message, with a few options.
Choose the option "Replace the file in the destination".
This will replace the 2 files of Build 1420, that are in your Broker's folder, with the 2 files of Build 1415.
To check that the Build of your Meta Trader 4, was downgraded to Build 1415, do like I wrote at the beginning, to find the Build number.
This is all, people.
Now you DOWNGRADED, and have installed Meta Trader 4 Build 1415, with AUTO UPDATE STOPED !!!
Thanks to the users pinakkolada and Enivid, that with their many replies to me, helped me probably, to solve this very bad problem.
I hope that this letter of mine, will save to many other people, a lot of suffer, big money damages, and many hours wasted, to solve this very bad problem.