Real APK Leecher works...so should apk-downloader
(but downloading .apk is not recommended...you might instead want to save it to apk through device)
EDIT: steps for Real Apk Leecher
- use this app to know your device id
- Download Real Apk Leecher and enter details it asks for (it asks for your google account password, so rather create a new account for this purpose exclusively)
- start earching and downloading apps
note: though it enlists even the paid apps, it can download only free apps...and you need Java Runtime to run the app...worked about 6 months ago....should still work perfectly...