Updated for new patching system.
Download the patch you need from Doki.co
and place it/extract it and the file to be patched in a folder (patches usually have the same name, so best to avoid putting them all in one folder).
Double click the "apply_patch.bat" (Linux users can use the apply_patch_linux file), and wait...
Rinse and repeat. Should you get an error, make sure the file name is the same as the one in the patch. You can do this by right clicking on "apply_patch.bat" selecting "edit" and checking the hilighted
file name part againt yours. If they are different copy the one from the patch and rename your file.
You should also check the CRC of the file to make sure it's not corrupt some how. For this i recommend using animechecker