Last updated: 14/10/2018

We'll sometimes upload testing builds to the test directory. Please join the discord to properly discuss the changes or check on the status of bugs when downloading these, as they aren't stable and may be updated daily.

Pre-release builds

Before we properly release a version to the public we need to ensure that there aren't any regressions. Specifically everything that you used to be able to do should still work without crashing or being buggy. While we have some tests internally, these don't cover the entirty of what is possible. Additonally it's a lot harder to run tests with every existing mod to ensure that we remain compatable with them all. This is when we rely on others to check to make sure that newer mods don't crash. Usually just downloading the current prelease build and adding it to a copy of your current world and modset is sufficent for testing (and reporting any new bugs or crashes to github or discord that arise from this).

(The last prereleases have been left up for testing purposes)

New features or content

Sometimes before finishing a feature fully and merging it into mainline (so that it can be released fully alongside everything else) we'll upload 'in-progress' features as seperate download files. Unlike pre-release builds, these are very unstable, and may not work between updates or even as a repleacement for the current version. (There are no tests running of this type at the moment. In the future we'll release new engine mechanics and robots here)

BuildCraft 7.99.19: prerelease 4

This is to try to find the performance impact of guide book searches (issue on github here: #4283). Please try to search with the guidebook and then upload "bc_perf_guide_search.txt" to that issue so that I can see where the issue is.


Minor improvements:
  • Added more detail to certain crashes when loading guide book entries.
Bug fixes:
  • [#4263] The guide book contents page doesn't display the full item tooltips.


Bug fixes:
  • [#4268] Partial fix for crash when loading with headcrumbs


  • Added profiling code to help test [#4283]


Bug fixes:
  • [#4283] Limit the maximum number of guide book results to 1200 (Compared to some modpacks which have ~25000 results for 'a')

Download 7.99.19-pre4:

Download the all-in-one jar, or in indervidual modules.