You will need 4 different Sony SDK files to use the Yoyo compiler. These files can be found in a large ~50GB torrent. You'll need to track that down yourself.

The names of the SDK files you'll need are:

VSI2015-2_4_2_6.msi

RazorInstallerForPS_Vita-3_60_0_5.exe

SDK-3_570_011-P03420862-P03421078-P03422528.zip

SNC-3_570_1.zip

Note: VSI and Razor will be tied to Visual Studio. I wouldn't recommend using the program online once you install them.

1. Download GayMaker and ensure the extracted directory does NOT contain the % symbol. If it does, Visual Studio won't be able to access it.

2. Download and install Visual Studio Community 2015. You'll need to make a microsoft account to do this. When installing, check the box for Visual C++. Activate Visual studio by logging into it once installed, then log out.

3. Extract SDK-3_570_011-P03420862-P03421078-P03422528.zip and SNC-3_570_1.zip. Merge the extracted /sdk/ folders together. After doing this, move the folder to C:\PSVITA (or wherever you want)

4. In Windows, go to Environment Variables (Search for it in the start menu)

5. Click on New... and add the variable name SCE_PSP2_SDK_DIR. Set the variable value to where you moved the sdk directory to (ex: C:\PSVITA\sdk). Procedure may be different on Windows 10.

6. Reboot your PC. When it reloads, double check that the environment variable was set by typing %SCE_PSP2_SDK_DIR% in the Windows explorer path bar. If set correctly you will jump to the sdk directory.

7. Open up GayMaker and click on Preferences. For SDK Location, set it to your merged sdk folder. For vcvars32.bat, set it to C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\vcvars32.bat. If vcvars32.bat does not exist, it means you didn't check the Visual C++ box when installing Visual Studio.

8. Install the following Sony SDK Programs:

- VSI2015-2_4_2_6

- RazorInstallerForPS_Vita-3_60_0_5

9. In GayMaker, check Use YYC, click on Make VPK, and if you followed the steps correctly you should generate a .VPK file.

Update 12.2.2019: