Can be downloaded here.
It has no changes relative to RC2. For the list of differences relative to v0.17, see posts for v0.18.0-rc1 and v0.18.0-rc2.
For people contributing training games, there's no need to rush to upgrade, it's fine to use v0.17.
There is a small known issue with time management. The version v0.18.0 times out sometimes when all of the following is true:
- Ponder is ON
- Time is added every X moves (e.g. every 40)
- There is per move increment