It is known as (and was re-branded) as Trimble SketchUp 8, from 28 AUG 2012 when Maintenance Release 4 (for v8) was released.
See SketchUp Release Notes:
http://help.sketchup.com/en/article/141303
So you should be using the latest Trimble version of SketchUp 8,
which is 8.0M5 ie:
Win 8.0.16846 Mac 8.0.16845
The actual sale was announced on 26 APR 2012.
See Trimble News Release:
http://www.trimble.com/news/release.aspx?id=042612a
Trimble provides support services for the Software as described at http://www.sketchup.com/support/policy.html.
(See section 17, http://www.sketchup.com/license/a/sketchup-pro)
Users of free editions that are no longer supported, can ask, but should not demand support of any kind.
Other topic threads on this subject:
- Google Sketchup 8 still free for commercial use?
- With an answer from AlexB, the former manager here.
- Sketchup - commercial use
- With a quote from John Bacus, product manager. (The actual article of the interview with Mr. Bacus, is not given in that forum post.)