Not enough space error when trying to install. but DRASTIC Ok, there are dupplicates of this post. I've seen them, I've read them, and they didn't help. I could perfectly install apps until I tried to update SnapLock through their own app. Not enough space error. Ok. I deleted a couple of things, tried again. Nothing. More than 1 GB of free space on my internal storage and around 10 in my SD card. I uninstalled SnapLock and tried to reinsatall it through Google Play, it didn't work, I downloaded the .apk, it didn't work either. The worst is that the SnapLock apk file is like 10 MB the largst and I can download and install stuff 20MB large without any issues. 
I don't really know if I have to contact the app developpers for this, but still.
Any help would be apreciated.
EDIT: I can't install n7player either. I actually had it installed and tried to reinstall it, wich is kind of frustrating.

My phone is a Xperia M2 D2303 btw.
Nico.
as you may have noticed, this is not simple to solve. I had a similar issue with the facebook messenger and solved it deleting some files and folders. to use my method you will need root privilages, the "terminal emulator" app and a file manager that can access to your whole file system (like "root browser"). I also have the "busybox" app installed which might be necessary to use the terminal emulator properly.

the first thing I did was to spot all files associated to the app i coudn't install. in my case I achieved this in the terminal emulator with the commands

su 

find / -name "*[some part of the package name]*"


the first command is to gain root priviledges in the terminal in order for the find command to be able to search you whole file system. the second gives you a list of files and locations related to the app you want to install. the text in brackets [ ] must be replaced by a part of the name of package which diatinguishes from all others. in my case the package of the fb-messenger is called " com.facebook.orca-21.0.0.20.13.apk" so i decided to search this way:

find / -name "*orca*"


then I deleted all the files and directories listed using the root browser (this is a brutal force method, may be it is not needed to delete them all...).

finally I rebooted my phone let it start and installed the messenger through google play store. it worked :)

I hope this helps. I also spent some hours searching forums with no success.