Try \usepackage{lscape}, and then \begin{landscape}...\end{landscape}
I have lscape on my system (standard install). It could be that
landscape.sty has been replaced by lscape.sty
In general, when you update TeX and you think you have lost something, it's
very likely that a different package supplies the functionality you're looking
for. TUG (TeX Users Group) is a good starting point for figuring out how to do
whatever with TeX.
--
missing landscape.sty
https://bugs.launchpad.net/bugs/138255
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