File path = new File(launcher.getLibrariesDir(), library.getPath(environment));
if (path.exists()) {
Library.Extract extract = library.getExtract();
if (extract != null) {
ZipExtract zipExtract = new ZipExtract(Files.asByteSource(path), extractDir);
zipExtract.setExclude(extract.getExclude());
zipExtract.run();
} else {
builder.classPath(path);
}
} else {
instance.setInstalled(false);