Apk sharing isn't something we encourage, sorry.
Aside from the potential security issues of installing apps that don't come via the market/amazon/getjar etc, a lot of devs don't like their apks to be distributed via unofficial channels, even if the app itself is free.
It might be worth contacting the dev, see if they'd be willing to send you the apk themselves (I've heard of some devs co-operating in the past).