hope you guys can help

installed ss 2.45
trying to get the FileSystem Connector Module installed. i did the following as per installation instructions:

* created a folder in the root of my silverstripe called " filesystem-connector "
* Extracted the archive to my SilverStripe root folder in a folder called "filesystem-connector"

tried to run " http://myserverip/silverstripe/dev/build

i get an error

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Not Found

The requested URL /silverstripe/dev/build was not found on this server.
Apache/2.2.3 (CentOS) Server at 192.168.0.20 Port 443

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what now?

any help greatly appreciated