show failure if curl is not installed

src/main/util.ts

@@ -2,6 +2,7 @@
 import { URL } from 'url';
 import path from 'path';
 import { log } from 'console';
+import { dialog } from 'electron';
 const fs = require('fs');
 const os = require('os');
 const { spawn, exec, ChildProcess } = require('child_process');
@@ -269,6 +270,7 @@ export async function installLocalServer() {
       options,
       (error, stdout, stderr) => {
         if (error) {
+          dialog.showMessageBox({message: `Failed to download Transformer Lab ${error}`});
           console.error(`exec error: ${error}`);
           return;
         }

src/renderer/components/Connect/LocalConnection.tsx

@@ -382,6 +382,12 @@ function InstallStepper({ setServer }) {
           setActiveStep(Steps.indexOf('CHECK_IF_INSTALLED') + 1);
           return true;
         }
+        setErrorMessage('Failed to download Transformer Lab');
+        setInstallStatus('error');
+        setThinking(false);
+        setUserRequestedInstall(false);
+        setActiveStep(Steps.indexOf('CHECK_IF_INSTALLED'));
+
         return false;
       },
       () => {