diff --git a/README.md b/README.md
index b9d4b9d..63e4c1a 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,15 @@ This is a profiling tool for SketchUp Ruby extensions. It wraps [`Benchmark`](ht
 
 ![Profiling in SketchUp](docs/images/profiling.png)
 
+## Installation
+There is no RBZ file! Download the ZIP archive of the code from https://github.com/SketchUp/speedup/archive/refs/heads/main.zip
+Inside you will find the `src` folder, this contains the extension structure (`speedup.rb` and `speedup` folder). Manually drop those into your SketchUp Plugins folder(s) and restart SU.
+
+## UI
+The extension adds a new sub-menu at:
+`Extensions > Developer > SpeedUp` (From SketchUp 2021.1)
+`Extensions > SpeedUp` (Before SketchUp 2021.1)
+
 ## Setup
 
 [RubyProf](https://github.com/ruby-prof/ruby-prof) is a gem that needs to be compiled as it's installed. This prevents it from being installed from within SketchUp under Windows. To compile gems you need the [Ruby DevKit](https://rubyinstaller.org/add-ons/devkit.html) to be configured for the compiler.
@@ -14,10 +23,16 @@ Additionally the gem started misbehaving in SketchUp 2017 and up. The profiler i
 
 To make it easier for SketchUp extension developers this extension bundles pre-compiled versions of RubyProf and will attempt to install it into SketchUp's gems directory.
 
+To initialise this process, you need to run the `Setup` command from the sub-menu at:
 `Extensions > Developer > SpeedUp > Setup` (From SketchUp 2021.1)
-
 `Extensions > SpeedUp > Setup`  (Before SketchUp 2021.1)
 
+If you have not run setup, you will see something like this in the Ruby Console:
+```
+Warning: SpeedUp was unable to activate the ruby-prof gem.
+Warning: SpeedUp was unable to load ruby-prof
+```
+
 ### Compatibility / Version Chart
 
 | SketchUp | Ruby | ruby-prof (Win) | ruby-prof (Mac) |
@@ -114,4 +129,4 @@ def fibonacci(number)
 end
 
 SpeedUp.profile { fibonacci(20) }
-```
\ No newline at end of file
+```
diff --git a/src/speedup/profile_test.rb b/src/speedup/profile_test.rb
index 2e386fb..0ecce63 100644
--- a/src/speedup/profile_test.rb
+++ b/src/speedup/profile_test.rb
@@ -39,7 +39,11 @@ def self.reload
       random_profile_method = self.instance_methods.grep(/^profile_/).first
       path = self.instance_method(random_profile_method).source_location.first
       $VERBOSE = nil
-      load path
+      if File.exist?(path)
+        load path
+      else
+        UI.messagebox("Method '#{random_profile_method}' could not be loaded from path #{path.inspect}. Was the code pasted into the Ruby Console?")
+      end
     ensure
       $VERBOSE = original_verbose
     end