PRE-DOWNLOAD WORD OF WARNING, READ!
Before you continue to the download page you should read the following blog pages, they might answer a lot of your questions before they even form.
Automatic Alpha Masking
User Interface Tour
You may want to visit the Discord Channel too!
Taking a look at the Bugtracker won't hurt either. Maybe the very thing you experience is already known or the suggestion already suggested.
If you're done reading and your head hasn't pop'd like a balloon yet you're free to go. If it did pop, NO GO FOR YOU. Head pop means brain gone, brain is a recommended system requirement.
- AVX2 Version is for very recent CPU's such as Ryzen and newer Intel models. This version is occasionally updated.
- AVX Version is for modern CPU's starting at AMD FX 6000 Series and Intel equivalents. This is always the most up-to-date version.
- Non-AVX Verison is for older-than-above CPU's before 2011/12. This version is occasionally updated.
In doubt, use AVX2. If the Viewer does not start up and does not give you any error message, use AVX, if the same happens there use the non-AVX version, each version can simply be installed over the other.
Should you get an error message on startup and you use Windows 10 you'll need to head over to the Microsoft website and download the latest Visual C++ Redistributable 2013 package, the Viewer requires it, comes with its DLL files but Windows 10 with all the latest updates requires new ones.
This software is not provided or supported by Linden Lab, the makers of Second Life.