Update base INSTALL to markdown and remove outdated content
diff --git a/examples/cpp/cpptutorial.md b/examples/cpp/cpptutorial.md
index cd1cddb..ef9ca99 100644
--- a/examples/cpp/cpptutorial.md
+++ b/examples/cpp/cpptutorial.md
@@ -91,7 +91,7 @@
Next we need to generate the gRPC client and server interfaces from our .proto service definition. We do this using the protocol buffer compiler `protoc` with a special gRPC C++ plugin.
-For simplicity, we've provided a [makefile](route_guide/Makefile) that runs `protoc` for you with the appropriate plugin, input, and output (if you want to run this yourself, make sure you've installed protoc and followed the gRPC code [installation instructions](../../INSTALL) first):
+For simplicity, we've provided a [makefile](route_guide/Makefile) that runs `protoc` for you with the appropriate plugin, input, and output (if you want to run this yourself, make sure you've installed protoc and followed the gRPC code [installation instructions](../../INSTALL.md) first):
```shell
$ make route_guide.grpc.pb.cc route_guide.pb.cc