pear install failed

[cobraBJ]

After running these command ,I got errors.

pear channel-discover element-34.github.com/pear
pear install -f element-34/PHPBrowserMobProxy

log:
C:\sysTest\case\main>pear channel-discover element-34.github.com/pear
Adding Channel "element-34.github.com/pear" succeeded
Discovery of channel "element-34.github.com/pear" succeeded

C:\sysTest\case\main>pear install -f element-34/PHPBrowserMobProxy
No releases for package "element-34/PHPBrowserMobProxy" exist
install failed

C:\sysTest\case\main>pear install -f element-34/Requests
No releases for package "element-34/Requests" exist
install failed

I downloaded PHPBrowserMobProxy manually,but it need another package Request,
Where is it? thank you~