I had to update old code which had been developed in "AVR Studio 4.0" I was unsuccessful in cleanly importing the 4.0 project into Atmel Studio 6.2 or 7.0 mostly due to the changes in the headers and libraries.
The last release was AVR Studio 4.19 and is downloadabe from the Atmel Studio archives on atmel.com which I downloaded. Turns out that direct installation under an up to date Windows 7 desktop would not work (which is well documented in this forum).
Using some suggestions in the forum, I found that installing in safe mode avoided the issues of the live W7 desktop. To install AVR Studio 4.19, Reboot and use F8 to enter safe mode then install normally using the default location. After installing reboot back to your normal W7 desktop.
Once installed you can create an AVR Studio 4.19 desktop launch icon from the executable in "C:\Program Files (x86)\Atmel\AVR Tools\AvrStudio4\AVRStudio.exe"
After installing AVR Studio 4.19 You must also install the appropriate GNU tool chain, also downloadable from the same Atmel web page. I used the last one for 4.x which is
avr-toolchain-installer-184.108.40.2069-win32.win32.x86.exe and installs normally without any weirdness.
Once installed you can open, compile and debug your old Studio 4.0 project normally.
There still might be some issues with USB device drivers to connect to the debugger modules but that's a separate issue.