Market Enabler doesn't work at all (tried one time).. Use Cracked Google Play Cracked Google Play 4.4.2.1
if your Android isnt rooted, try Framaroot 1.7.0
Didn't know until today (after reading your post /fail)
Actually needs root to backup signed applications.
if you don't mind installing some extra things on your android you can use framaroot (link above)
and install Script Manager (Google Play link)
(it takes 40 seconds to do it... not hard) Install framaroot only if your android isnt rooted
(no problem if yours is rooted tho but not needed...)
Framaroot is just press in any exploit that appears bellow (like in the pic) and way to go
you're rooted.
Since i have free-time, made a tutorial with pics. Step 1: Installing Framaroot (Only if your android isn't rooted
Part 2: Using Script Manager
Now open Script Manager...
Go to "system>mnt>asec" and look for the application that you installed
A tip: after "net." there is always the company name after like "net.moeapp..."
Sending the APK file to e-mail or any cloud (easy way)
Our Target is "pkg.apk" file. Mantain pressed for 3 seconds on the file, and will open a menu.
You can use share (easier). You can use Google drive, mail etc... (just send it to yourself)
Copying on SD Card (more annoying lol)
If you choose copying... press the Green button to go back. Very important!
(if not will cancel the copy command) go back to the Root folder and look for SD Card folder
Now you're inside the sdcard, just choose the folder you want to save
(for example i choose DCIM) and press "Select this directory" Done.
After you install framaroot and Script Manager, just take 30 seconds or so to make it
If you dont wanna do it... whoknows... a donation section kekeke