To start downloading GNS3 1.X software, an account must be registered. Go to https://community.gns3.com/welcome
Select Register
Enter an email address and click Confirm address
Check the email as there will be a message that contains further instruction on how to proceed.
Receiving an Email Validation from GNS3
Email Validation from GNS3. This is just an illustration as Gmail is used for this illustration.
Enter all the (Required) information and click Create Account
Select DOWNLOAD GNS3
Select the Platform to download GNS3 1.X