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As you may find that I am newbie using Atmel studio and its Arduino extension.
Arduino and its IDE is familiar.

I seem to need some help installing Arduino under Atmel Studio.

Am I missing something important because I cannot get Arduino extension into Atmel Studio?

I start Extension manager and select Arduino. Extension manager starts Firefox (??) and which starts downloading it.

After download I start the .msi file and it is installed succesfully. The lastime I installed it under Atmel Studio extension folder. BUT what then?

As a reference I loaded SAM D20 extesion. Extension manager starts an extra window for downloading.
After download the second window is opened for installation.
After succesfull installation a new button is set to restart Atmel studio.
After restart the new extension is in installed list.

I tried some tricks but they seemed only to confuse Atmel studio because Extension manager tells that I own already one on the Available Downloads BUT not on the installed side neither there is nothing Arduino related under any tool.

I also tried to use MicroManager but I do not see any command Tools>Visual Micro>Reset User Interface.

I would like to use it because I am tired to original IDE especially when trying to find errors and dubugging bigger projects.

Please advise?
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Regards Esa N

Thank you Tim for rapid answer

I am using AS 6.2.993 Beta. Using its Extension Manager is confusing bacause it seems to point to the older version of Visual studio for Arduino.
Which is very confusing if you are not aware. I was not.
Maybe I explaned badly what happened. EM started FF for download. After download I started .msi file to get VS installed.
Today morning I did as you instructed. Downloaded the Beta version of VS.
Started AS6.2 and, BINGO, VS started asking information.

Thank you very much 
Esa N

OK. That is fine.

There is still something strange in my setup because I get error messages using one library. Arduino IDE compiles same file gladly without errors. (IBM Laptop WIN XP). My main Arduino tool.

#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x20,16,2);  // set the LCD address to 0x20 for a 16 chars and 2 line display

void setup()
{
  lcd.init();                      // initialize the lcd 
 
  // Print a message to the LCD.
  lcd.backlight();
  lcd.print("Hello, world!");
}

void loop()
{
}

BUT the same sketch using VS gives error messages:
Compiling 'HelloWorld' for 'Arduino Uno'
HelloWorld.ino:8: error: no matching function for call to 'LiquidCrystal_I2C::LiquidCrystal_I2C(int, int, int)'
LiquidCrystal_I2C.h:LiquidCrystal_I2C(uint8_t, uint8_t, uint8_t, uint8_t, uint8_t, uint8_t, uint8_t, uint8_t)
LiquidCrystal_I2C.h:LiquidCrystal_I2C(uint8_t, uint8_t, uint8_t, uint8_t)
LiquidCrystal_I2C.h:LiquidCrystal_I2C(uint8_t)
LiquidCrystal_I2C.h:LiquidCrystal_I2C(const LiquidCrystal_I2C&)
LiquidCrystal_I2C.h:In function 'void setup()'
LiquidCrystal_I2C.h:175: error: 'int LiquidCrystal_I2C::init()' is private
HelloWorld.ino:12: error: within this context
Error compiling

Why?

But it is strange because I loaded the same setup into my second computer (Table PC running also WIN XP). Building the same file in that, is succesfull without errors.

I do not remember from where I downloaded the libray but it is:
LiquidCrystal_I2C V2.0

I tested an other example code which uses "normal" LCD Library and it was OK.

I tested also some  other own projects and I am pleased how VS works.
I would like to see line numbers on the side bar. I use jEdit a lot.

I prefer to use Laptop because I have some projects which need it.

Thanks
Esa N

Thank you for your reply and the hint of adding line numbers.

You are right with "doubled" files. In laptop I have NewLCDLibrary which contains also I2C part. But because my table PC is just set up from "fresh" I have only the original LCDLibrary. 
So meanwhile I have to put the original LCD library back to laptop and have to go through my projects to find out where I used that new one. Not a big deal.
The main thing is that I get everything working properly so far.

best regards
Esa N