Ran the Craft Updater from Control Panel the current install is no longer working The previous install (3.0.34) was working fine until I ran the updater from the CP. The update failed with error (couldn't access web.config (IIS))

Now loading CP or front end displays the following error:
Warning: require(C:...Craft\Projects\Untye/vendor/craftcms/cms/bootstrap/web.php): failed to open stream: No such file or directory in C:\Users\rickn\Documents\Craft\Projects\Untye\web\index.php on line 20

Fatal error: require(): Failed opening required 'C:...\Craft\Projects\Untye/vendor/craftcms/cms/bootstrap/web.php' (include_path='.;C:\php\pear') in C:...Craft\Projects\Untye\web\index.php on line 20

Is there a way to finish the install manually and keep the previous work and data?

{
"require": {
   "craftcms/cms": "3.0.35",
 "vlucas/phpdotenv": "^2.4.0",
    "craftcms/redactor": "^2.1",
"craftcms/mailgun": "^1.3",
   "craftcms/contact-form": "^2.2",
"indigoviking/liquid-letters": "^1.2",
    "lukeyouell/craft-contactformtemplates": "1.0.1",
"doublesecretagency/craft-bootstrap": "4.1.1.2",
   "fatfish/navigation": "1.0.7",
 "superbig/craft3-templateselect": "^2.0",
   "craftcms/ckeditor": "1.0.0-beta.2",
 "verbb/navigation": "^1.0",
   "enupal/slider": "1.2.2",
 "studioespresso/craft-dumper": "^1.3",
   "topshelfcraft/wordsmith": "^3.0",
 "craftcms/craft": "^1.0"
 },
 "autoload": {
 "psr-4": {
    "modules\": "modules/"
  }
 },
 "config": {
   "optimize-autoloader": true,
 "platform": {
     "php": "7.0"
  }
 },
 "scripts": {
  "post-root-package-install": [
 "@php -r \"file_exists('.env') || copy('.env.example', '.env');\""
   ]
 }
}
Try running
    composer update
Via the command line while in ssh

Or download the latest Craft files and replace your files. Mainly vendor/craftcms it looks like.

Edit:

Update composer.json to this and try running composer update again.

{
  "require": {
    "craftcms/cms": "^3.0.35",
    "vlucas/phpdotenv": "^2.4.0",
    "craftcms/redactor": "^2.1",
    "craftcms/mailgun": "^1.3",
    "craftcms/contact-form": "^2.2",
    "indigoviking/liquid-letters": "^1.2",
    "lukeyouell/craft-contactformtemplates": "1.0.1",
    "doublesecretagency/craft-bootstrap": "4.1.1.2",
    "fatfish/navigation": "1.0.7",
    "superbig/craft3-templateselect": "^2.0",
    "craftcms/ckeditor": "1.0.0-beta.2",
    "verbb/navigation": "^1.0",
    "enupal/slider": "1.2.2",
    "studioespresso/craft-dumper": "^1.3",
    "topshelfcraft/wordsmith": "^3.0"
  },
  "autoload": {
    "psr-4": {
      "modules\\": "modules/"
    }
  },
  "config": {
    "optimize-autoloader": true,
    "platform": {
      "php": "7.0"
    }
  },
  "scripts": {
    "post-root-package-install": [
      "@php -r \"file_exists('.env') || copy('.env.example', '.env');\""
    ]
  }
}