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How do I use Modify Variable to concatenate? For example '946' & '789' = '946789'

If you want concatenate two or some variables then use Set Variables command.
var1=946
var2=789

Variable Name: varname
Value: #var1##var2#
Also, you can specify value like this
Value: text#var1##var2#some text#var3# some text

Free info like this is an apple from the tree of kwolnedge. Sinful?

Is it possible to do create silent installation exe file instead of user interaction to select the path and confirmation.

If it is possible then please explain with example.It will be helpful for me.

Thanks in advance.

Yes, you can do that. Therу is -silent command-line parameters which can be redefined in Project - Settings - Silent Command-Line Parameter.
If you run setup.exe -silent then all dialogs will be hidden and all values of variables will be by default as they are assigned in Set variables (for example).
Also, you can define different values in depending of command-line parameters with Command-Line Parameters command
http://www.createinstall.com/help/command-line-parameters.html

If you want the silent installation without using command-line parameters then do not use any Dialog commands in Install Script.