QuickInstaller is simple ps vita tool which let you install vpk via qcma.
Windows & .NET Framework 4.5 or above. (OS X and Linux are not officialy supported yet. feel free to test via mono.)
Create a directory named 'whatever'.
Extract downloaded zip file into 'whatever'.
Create a directory named 'vpk' in 'whatever'.
Put vpks into 'vpk' or extract to each directories and put them in 'vpk'. (VPK files are not changed, extracted directories will be removed.)
Run QuickInstallerPC.exe. ('work' and 'mp4' directories are automatically purged.)
Copy every files in 'mp4' to VITA via qcma.
Install QuickInstaller.vpk on your VITA. (you don't need to this everytime.)
Wait for "Done." is showing up. (or can be failed. :P)
Failed to convert vpk to mp4. - just extract it and put contents into new directory (for example, extract Hastune_Miku_Project_Diva_F.vpk into vpk/hmpd/VPK_CONTENT_HERE)
Failed to copy mp4 files. - remove every directories in ux0:video and try again.
Failed to install package. - content might not be vpk or broken. (for example, mai dumps cannot be installed directly yet.)