HELLO ..
here i'll give you 2 methods to download .APK files from play store to your pc..

TUTORIAL NO 1.



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APK Downloader is a Google Chrome extension that allows you to download Android APK files from Android Market to your PC


Download and Install: *USE AT YOUR OWN RISK*
[Only registered and activated users can see links. ]


Requirement:
Chrome 17 or later
(I suggest Google Chrome 19 )
* Please read and follow this instruction carefully before using, or it WON’T WORK *
After installed APK Downloader, you’ll need to follow these steps in able to use it

I. Disable SSL error warnings
If you don’t do this step, the extension WILL NEVER WORK.
Below instruction is for Windows users. For OS X and Linux users, please read
( replace --remote-debugging-port=9222 in the example with --ignore-certificate-errors )

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1. Right click on Chrome shortcut, select “Properties”
2. Switch to “Shortcut” tab. In “Target” field, insert [space]--ignore-certificate-errors[space]--allow-running-insecure-content at the end. Once you have that finished, click “OK” .
It will look something like this:
C:\…\chrome.exe --ignore-certificate-errors --allow-running-insecure-content
or
“C:\…\chrome.exe” --ignore-certificate-errors --allow-running-insecure-content
Close Chrome and open it again with that shortcut
3. Open APK Downloader Options page. If your screen looks like the right picture ( the warning box is gone ), then you disabled SSL error warnings successfully
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1. There are two ways to get Email and Device ID
a. Easy way: install this [Only registered and activated users can see links. ] app, it will show you your emails and Device ID
b. Difficult way: Open dial pad, call *#*#8255#*#* ( 8255 = TALK ). If it opens “GTalk Service Monitor”, find lines that begin with JID and Device ID. Your email is JID, and your device id is a string that after android- prefix
For example: if it shows android-1234567890abcdef , then your device ID is 1234567890abcdef
Do not type in random email or device ID, it won’t work
2. Enter your email’s password, then press Login. If everything is ok, now you can use APK Downloader


III. Start using
After finished two steps above, you can start using APK Downloader. Open [Only registered and activated users can see links. ], view any FREE apps ( for example: [Only registered and activated users can see links. ] ), then press the APK Downloader icon on address bar ( see screenshot )
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ALL CREDITS GOES TO
redphoenix89
for FAQs click here.its a official blog for this trick



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TUTORIAL 2

Real APK Leecher

Real APK Leecher v1.3.5 (this tool is not mine, I just share it)
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Real APK Leecher allows you to download android APK files from Android Market to your PC.

Features:

  • Download APK from market to your PC
  • Download apk icon (just for fun ] - Vendor name
    - Package name. Ex: com.android.helloworld
    - Custom


Change logs:
9/6/2012 – core update

  • Fix downloading. Now any apps could be downloaded fine.
  • Download apps you purchased with your account is now available.
  • Add an option to ask the name you want to save the apk with.
  • Support Linux version (only for downloading, not scanning now)
  • Add FAQ

9/4/2012: v1.2.4 – removing “Pin this program to Taskbar” due to crash often. Sorry for inconvenient.

  • remove “Pin this program to Taskbar”
  • Fix download with apps with name contains “/”

8/4/2012: v1.2.3 – removing carrier restrictions

  • remove carrier restrictions (go Option to choose your SIM Operator Numberic)
  • Delete apk file
  • Add “Pin this program to Taskbar” (more like winform application)

Some apps have carrier restrictions. On Android phone, you must have root permission to be able to fake carrier with Market Enabler app to download those apps. But now, Real APK Leecher gives you an option to setup SIM Operator Numberic (SON) to fake carrier. You can get SON by the following formula: SON = MCC + MNC. For example, T-Mobile has MCC 310, MNC 260, so SON is 310260. If you don’t need this feature, just leave SON empty in Option. [Only registered and activated users can see links. ] is the list of MCC and MNC.
28/3/2012: v1.1.9 – quick fix for removing country restrictions

  • remove country restrictions (go Option to choose your language/country)

25/3/2012: v1.1.8 – core update adding some useful features


  • Option to scan existing apk folder to compare its version with market version
  • Rename apk file manually
  • Rename all apk files automatically with file name format option
  • Download apps with option to select file name format
  • Copy link location on Google Play
  • Search related apps
  • Fix download app that contains “:”
  • Check update for new version




Instruction:
To use this tool, you need enter your market account and Device ID. To get your Device ID, just simply open dial pad, press *#*#8255#*#*. If it opens “GTalk Service Monitor”, find lines that begin with JID and Device ID. Your account is JID, and your device id is a string that after android- prefix.

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Note:
- Use at your own risk. I’ll not take responsibility for anything happen to you or your account.
- This tool request Java Runtime Environment(JRE) or JDK.
- Do not delete "lib" folder.

Thanks:
- Tim Strazzere for his [Only registered and activated users can see links. ].
- CodeBlue for his awesome tool.




More screen shot:
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I suggest you to make new google account for this tool..If you Dont want to take any chance with your main gmail account.
Once you create new gmail account add that account in to your device and select that account in google play in your phone.and download any free app..By doing this your device will be added to your new gmail account and now you can switch back to your old account in your phone..

For faQs CLICK HERE Official blog for this trick


DOWNLOAD Real APK Leecher v1.3.5 :: [Only registered and activated users can see links. ]