Im not shure if this is a good option.
The "Replaces the following Versions" is decimal (17 not 1.1).
You should at least show the decimal verstion too, or allow both (dec and ets, there is enough room for another textbox :))

Also it doesnt work on my project:

If i enter 1 and 5 it makes 1.5?

Here I made changes to add a new field below the original version in application tab.
So the user can choose, if he wants to change the version like ETS style or XML style.

Yes, if you enter 1 and 5 it will be version 1.5
If you want to change the mayor version, you can set the cursor to the place and change it.

Perfect, could you fix it so Versions lower 16 are not shown as hex :)
Then i will merge it.

Now every not numeric version is not shown in the ETS version field.
It will be blank, if the version contains a not numeric digit (as hex conversion)

There are still versions that dont work.

10 - 15
25 - 31
etc...
so every version which would be x.10-15 since ToString("X") would do x.A-F

why not something like:

int major = Math.Floor(value / 16);
int minor = value % 16;
return $"{major}.{minor}"

I added some code to convert the input back to int.
Now there should be no possibility to enter a wrong version number into the textfield.

this works perfect :)