Getting 404 page on site/themesetup

Pl help resolve 404 page shown on site/themesetup.

(Site loading properly, also able to login into Admin panel)

I followed the Steps to upgrade theme:
1. mode was already default
2. unzip theme zip in magento root (i.e, where the bin, var, app folder are there)
3. ran site/themesetup
Got error.
Checked in /var/report/(errorno)

{"0":"Please upgrade your database: Run "bin/magento setup:upgrade" from the Magento root directory.nThe following modules are outdated:nMagefan_Community schema: current version - 2.0.6, required version - 2.0.12nMagefan_Community data: current version - 2.0.6, required version - 2.0.12nMagefan_Blog schema: current version - 2.9.0, required version - 2.9.4nMagefan_Blog data: current version - 2.9.0, required version - 2.9.4nMagefan_WysiwygAdvanced schema: current version - 2.0.3, required version - 2.0.7nMagefan_WysiwygAdvanced data: current version - 2.0.3, required version - 2.0.7","1":"<pre>#1 Magento\Framework\App\FrontController\Interceptor->Magento\Framework\Interception\{closure}() called at [vendor/magento/module-page-cache/Model/App/FrontController/BuiltinPlugin.php:69]n#2 Magento\PageCache\Model\App\FrontController\BuiltinPlugin->aroundDispatch() called at [vendor/magento/framework/Interception/Interceptor.php:135]n#3 Magento\Framework\App\FrontController\Interceptor->Magento\Framework\Interception\{closure}() called at [vendor/magento/framework/Interception/Interceptor.php:153]n#4 Magento\Framework\App\FrontController\Interceptor->___callPlugins() called at [generated/code/Magento/Framework/App/FrontController/Interceptor.php:26]n#5 Magento\Framework\App\FrontController\Interceptor->dispatch() called at [vendor/magento/framework/App/Http.php:137]n#6 Magento\Framework\App\Http->launch() called at [generated/code/Magento/Framework/App/Http/Interceptor.php:24]n#7 Magento\Framework\App\Http\Interceptor->launch() called at [vendor/magento/framework/App/Bootstrap.php:261]n#8 Magento\Framework\App\Bootstrap-n

So, ran setup upgrade.
It ran successfully with ‘nothing to do’.

Now, once again ran site/themesetup in browser, but this time it should a 404 page (just like a 404 page in normal site,..i.e, the 404 I get is random url is hit on browser.. site.com/dsfjsdlkflds

I unzipped the theme file again, and again tried site/themesetup

However, getting same 404 page.

Pl. help