diff --git a/src/bin/cli.ts b/src/bin/cli.ts
index 20778d1..edf43be 100644
--- a/src/bin/cli.ts
+++ b/src/bin/cli.ts
@@ -17,4 +17,7 @@
 import { run } from "@stricli/core";
 import { buildContext } from "~/context";
 import { app } from "~/app";
-await run(app, process.argv.slice(2), buildContext(process));
+const plainOutput = process.argv.includes("--plain-output");
+const inputs = process.argv.slice(2).filter((arg) => arg !== "--plain-output");
+
+await run(app, inputs, buildContext(process, plainOutput));
diff --git a/src/context.ts b/src/context.ts
index ed69458..0f95fdb 100644
--- a/src/context.ts
+++ b/src/context.ts
@@ -34,7 +34,7 @@ export interface Context extends CommandContext {
   readonly fetch: typeof globalThis.fetch;
   readonly open: typeof open;
   readonly http: typeof http;
-  readonly makeTaskLogger: TaskLogger;
+  makeTaskLogger: TaskLogger;
   readonly env: ParsedEnv;
 }
 
@@ -50,7 +50,10 @@ export async function exists(
   }
 }
 
-export function buildContext(process: NodeJS.Process): Context {
+export function buildContext(
+  process: NodeJS.Process,
+  plainOutput = false,
+): Context {
   const env = getParsedEnv();
   return {
     process,
@@ -63,6 +66,8 @@ export function buildContext(process: NodeJS.Process): Context {
     path,
     fetch,
     makeTaskLogger:
-      env.NO_COLOR === true ? plainTaskLogger() : fancyTaskLogger(),
+      plainOutput || env.NO_COLOR === true
+        ? plainTaskLogger()
+        : fancyTaskLogger(),
   };
 }
diff --git a/src/gm-options.ts b/src/gm-options.ts
index bb6eea3..fcb2f9e 100644
--- a/src/gm-options.ts
+++ b/src/gm-options.ts
@@ -217,7 +217,7 @@ export async function readGmOptions(
     gmOptions = parseResults.options;
   } else {
     throw new KnownError(
-      "Failed to parse 'gm-options.json file. Errors:\n{parseResults.error}",
+      `Failed to parse 'gm-options.json file. Errors:\n${parseResults.error}`,
     );
   }
 
diff --git a/src/gms2/install-runtime.ts b/src/gms2/install-runtime.ts
index 5f644e4..e2e7b81 100644
--- a/src/gms2/install-runtime.ts
+++ b/src/gms2/install-runtime.ts
@@ -233,10 +233,22 @@ export async function installRuntimeIfNeeded(
   });
   let runtimeLocation = await findRuntimeLocation(ctx, runtimeDir, version);
 
-  // FIXME: if this fails, we should delete the runtime dir and try again
-  const installedModules = runtimeLocation
-    ? await getInstalledRuntimeModules(ctx, runtimeLocation)
-    : [];
+  // A runtime directory can be left behind by an interrupted or failed
+  // installation. In that case receipt.json may be missing or corrupt.
+  // Treat the cached runtime as invalid and reinstall it instead of failing
+  // every subsequent build.
+  let installedModules: Module[] = [];
+  if (runtimeLocation) {
+    try {
+      installedModules = await getInstalledRuntimeModules(ctx, runtimeLocation);
+    } catch {
+      log.message(
+        `Cached runtime at '${runtimeLocation}' is invalid; reinstalling...`,
+      );
+      await ctx.fs.rm(runtimeLocation, { recursive: true, force: true });
+      runtimeLocation = undefined;
+    }
+  }
 
   if (runtimeLocation && installedModules.includes(target)) {
     log.success("Runtime found");
diff --git a/src/gms2/use-gms2.ts b/src/gms2/use-gms2.ts
index b9367fb..38e007b 100644
--- a/src/gms2/use-gms2.ts
+++ b/src/gms2/use-gms2.ts
@@ -144,6 +144,16 @@ export async function useGms2(
     );
     igorAction = action;
     extraArgs = ["-tf", targetFile, ...packageArgs];
+
+    // Igor uses the build cache output directory for intermediate package files.
+    // Clear those intermediates before every package operation so a previous
+    // package with a different output name cannot leave a file that Igor tries
+    // to move again. See https://github.com/YoYoGames/gm-cli/issues/243.
+    await ctx.fs.rm(ctx.path.join(buildCacheDir, "output"), {
+      recursive: true,
+      force: true,
+    });
+
     successMessage = `Package created: ${targetFile}`;
   }