Actually, when you get the error for not enough space for applications, it means that your root partition (/dev/mmcblk0p2, about 4GB in size) is filled up. You may have loads of space still available on the device, for example on a 64GB device your MyDocs partiton (/dev/mmcblk0p1) is about 54GB and most of it is propably free...

If you absolutely must have more installed applications, you could repartiton your flash so that you'd have for example 45GB of MyDocs, 15GB of root and 2GB of home.