1: unpack all 3 archives
2: mount 1 - Vocaloid2 - Hatsune MikuMIKUMIKU.iso
3: run setup, when prompted to select complete or custom install, select custom install (bottom option), deselect vsti, hit next, and install to default location (or wherever you want to install to) ...
4: when install is done, SELECT NO to "do you want to activate now?" ...copy 1 - Vocaloid2 - Hatsune MikuCrackVOCALOID2 Miku Crack.exe to the installation directory and run it. When prompted to continue, select Yes. It will patch the exe. Afterwards, run Vocaloid2.exe make sure there are no errors, then close it. Delete the crack and proceed.
5: Mount 2 - Vocaloid2 - Kagamine Rin&LenRIN_LEN.MDS, and follow the same setup directions, when prompted, select custom install, deselect vsti, and install to default location or same location you installed to in step 3.
6: When completed, select NO to "do you want to activate now?" ... copy the keygen from 2 - Vocaloid2 - Kagamine Rin&LenVOCALOID2_keygen to the install directory, run it. Select your network card in the list presented and hit "generate" it will create a file "VOCALOID_ActivationKey.txt"
7: verify that the txt file exists, then run Activate2.exe, when asked to activate, hit yes, when prompted, select "This PC has no internet connection (Activate VOCALOID2 with another PC.)" on the next screen, near the bottom, select import activation key, and browse to the activation key that you generated, and select open. It will activate, and youre done with this part! Delete the keygen, but LEAVE THE TXT FILE THERE, YOU WILL NEED IT AGAIN!!!
8: Run 3 - Vocaloid2 - Prima (ENG)PrimaSetup.exe and follow the installation, this time, do a complete install including vsti. Install it to the same location you installed the others to. Vsti will install to a different directory, that's okay...
9: When it's done, Select YES to "do you want to activate now?" and follow the same activation method you did previously for rin/len (Step 7), selecting offline activation, and then importing the activation key you had generated.
10: when done, run vocaloid2, if you had no errors, great ! then hit ALT-S for settings, then S -> singer editor, and verify you have Miku then Rin and Len , and last installed is Prima ...
11 : Enjoy Vocaloid2 with Miku, Rin and Len, all with a nice english interface ... Plus Prima makes for nice background vocals too ...