Since Avastar was released in 2012 we have offered Avastar with a Pay once, get free updates forever policy. This means that regardless when you purchased, and regardless how much effort we put into the development of our Tool:
If you purchased before december-2014 then you will never have to pay anything for new updates of the software.
But we can no longer promise this same free update offer to new purchasers. Since 5-dec-2014 we only give away one year of free update and support to new purchases. New purchasers will get an annual renewal offer instead. If a new purchaser declines the annual renewal offer, then nothing serious will happen. You can keep working with the product as long as you like, you just no longer get updates.
Remind: If you have already purchased Avastar at any time over the past 3 years,
then you get all future updates for free
Excerpt from the new Terms of Agreement (README.txt):
============================ Limited Downloads & Updates ============================ With your purchase you are eligible to download this product. The downloaded software can be installed on recent versions of Blender and it will run without any time limitations (it runs forever). With your purchase you also get one year free update and support. For more detailed information please read: http://blog.machinimatrix.org/support/ We will offer you an annual renewal of your support for a discount of 50% of the up to date product price. If you reject the offer then nothing will happen, you may continue using the product as long as you like. You only won't get new updates any longer and we won't be able to offer you free support in that case.