Run trillian-v4.0a-current.exe to install Trillian and once it s done choose Launch at the end
page.
If you haven t set up an account yet click on New Account and select Log In Existing Account, enter
some bogus details in the Name and Password boxes  this information won t be used anyway . Then
choose Log In.
Enjoy the program 
Contact list editing should hopefully work now aswell  it does for me anyway  : 
-Cracked by Homer
Official Release notes
Build 99
Build 99 is now available, featuring additional bugfixes and stability improvements. As a reminder
to current testers, Build 99 re-activates our premium membership code. We   ve been listening
carefully to your feedback over the past few weeks and have made some additional changes to the way
our premium offerings will work in response to user suggestions and our own internal decisions.
More
information below for those who are interested - enjoy the build 
We   ve received lots of great feedback since releasing Build 98, and think we   ve crunched most
of it into the next iteration of changes to the way we   ll be selling Trillian. In short:
  We will be selling Trillian Pro 4.0 as a standalone product. The price will remain at  25.
  Premium features and premium services will both be included in this product. Neither will ever
expire - when you purchase the product, you can use it for as long as you   d like. This is a major
shift from our previous stance; upon reflection, we decided this was the best model in terms of
customer value and comprehension.
  We will provide minor upgrades  4.0 patches, possibly 4.1, 4.2, etc  for free at our discretion.
Major upgrades  5.0  will not be free, but we will continue to patch older versions as we   ve done
in the past. Previous customers will be given an upgrade price; new customers will pay in full.
  The basic product is getting two new features: core video chat  no fancy features or filters  and
full control over the knowledge bar preferences.
  We will honor  existing  customer expiration dates under the old    1 year of upgrades   
program. If, for example, your current account will expire in 2015, there is a chance you   d
receive 4.0, 5.0, and 6.0 for free.
We believe this system is easy to understand, fair to customers, and will continue to provide us
with a reasonable way to monetize Trillian. As a reminder to those of you who have recently
upgraded
or purchased Trillian and wish to see your payment reflected on your Astra Account, be sure to link
the payment in our members area, and remember to login with your Astra Username 
As always, we will continue to listen to customer feedback and suggestions as we move closer to a
final release. Thanks for your continued feedback and support