diff --git a/.gitignore b/.gitignore
index 7eb65e7..5c5e954 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 _build/
 dist/
+artifacts/
 *.msi
 *.wixpdb
 *.cab
diff --git a/README.md b/README.md
index 79657be..78dc4e5 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,8 @@ more than that zip layout.
 rbmanager is a small version manager in the spirit of Python's install
 manager (PEP 773): it fetches a binary-package zip, extracts it under
 `%LOCALAPPDATA%\Ruby\rubies\`, and makes it available on PATH. No
-elevation is required at any point. Both names mirror pymanager: the
+elevation is required for rbmanager itself or for the per-user rubies;
+see below for the one exception. Both names mirror pymanager: the
 command is `rb` as pymanager's is `py`, and the data directory is named
 after the language (`%LOCALAPPDATA%\Ruby`, like `%LocalAppData%\Python`)
 rather than after the tool. rbmanager remains the product name.
@@ -41,6 +42,17 @@ it (signature-verified, elevated); `--yes` skips the consent prompt.
 C extension gems with MSVC; see
 [docs/devkit-enable.md](docs/devkit-enable.md).
 
+The official mswin packages deliberately do not bundle
+vcruntime140.dll (https://bugs.ruby-lang.org/issues/22180) and expect
+the machine-wide Microsoft Visual C++ Redistributable instead. That
+component installs per-machine, which is the one exception to the
+no-elevation rule: when it is missing, `rb setup` offers to download
+and install it through a single UAC prompt. Declining the consent
+question or the UAC prompt leaves rbmanager and the installed rubies
+intact; `rb setup` prints the installer URL so an administrator can
+install it manually, and `rb install` / `rb use` merely warn that
+ruby.exe cannot start until the runtime is present.
+
 The active ruby is exposed through an NTFS directory junction
 `%LOCALAPPDATA%\Ruby\current`, and `install` appends
 `%LOCALAPPDATA%\Ruby\current\bin` to the user PATH once; switching
diff --git a/src/rbmanager/VcRedist.cs b/src/rbmanager/VcRedist.cs
index c636611..03bbc81 100644
--- a/src/rbmanager/VcRedist.cs
+++ b/src/rbmanager/VcRedist.cs
@@ -76,11 +76,12 @@ public static async Task<int> Ensure(bool assumeYes)
             return 0;
         }
 
-        Console.WriteLine("""
+        Console.WriteLine($"""
             The Microsoft Visual C++ Redistributable (x64) is not installed.
             Ruby's official Windows packages rely on it; without vcruntime140.dll
             ruby.exe cannot start. Installing it affects the whole machine and
-            prompts for administrator approval (UAC).
+            prompts for administrator approval (UAC). Without administrator
+            rights, ask an administrator to install {InstallerUrl} instead.
             """);
         if (!assumeYes)
         {