fix(installer): bubble up exceptions during install

installer/lib/installer.py

@@ -215,12 +215,12 @@ class InvokeAiInstance:
 
         src = f"invokeai=={version}" if version is not None else "invokeai"
 
-        from plumbum import FG, local  # type: ignore
+        from plumbum import FG, ProcessExecutionError, local  # type: ignore
 
         pip = local[self.pip]
+        _ = pip["install", "--upgrade", "pip"] & FG
 
-        _ = (
-            pip[
+        pipeline = pip[
             "install",
             "--require-virtualenv",
             "--force-reinstall",
@@ -232,8 +232,15 @@ class InvokeAiInstance:
             extra_index_url,
             pre,
         ]
-            & FG
+
+        try:
+            _ = pipeline & FG
+        except ProcessExecutionError as e:
+            print(f"Error: {e}")
+            print(
+                "Could not install InvokeAI. Please try downloading the latest version of the installer and install again."
             )
+            sys.exit(1)
 
     def configure(self):
         """