llvm dev - Aug 2018 - Broken links for past presentations' material

Hi All,

I am a newbie and I am trying to learn a few basic concepts by going
through some of the past devmtg presentations/Tutorials. I see that the
videos for the talks from October 2014 and April 2015 are not available
(broken links). Does anyone know where I can find them?

P.S:  I came across this thread where there was a mention about one of
these material - http://lists.llvm.org/pipermail/llvm-dev/2017-June/
113848.html but not sure if there was a conclusion.

Thanks a ton in advance!
- Shweta
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