Invision Community is a platform for building communities with forums, eCommerce, content management, image galleries and more. It is written in PHP and uses MySQL as a database management system.

Here is steps followed for upgrading Invision Community script from IP. 3.4.x to IPS4.0

1. Backup created for files and MySQL database

2. Uploaded a IPS 4 requirement test script and upgraded the PHP as recommended by the script

3. Created new folder ib4 and uploaded IPS4.0 files

4. I made a copy of IP.3 Database and restored in a new Database

5. Copied the following folders, downloads, public, screenshots and uploads along with your conf_global.php file.

6. Updated conf_global.php with new Database and new url (sitename.com/ib4)

7. Got error when I run the upgrader – sitename.com/invision4/admin/upgrade/. So removed the following from conf_global.php and Upgrade started to working.

$INFO['mysql_tbl_type']		=	'MyISAM';
$INFO['sql_tbl_prefix'] = 'x_utf_ib3_';
$INFO['sql_charset'] = 'utf8'; 

8. Check the screenshots here

9. The next screen asked to convert Database to UTF8.

So I downloaded the converter here and uploaded it to ib4 folder. See the screenshots.

10. Then Clicked the Proceed with upgrade link.

After the upgrade got blank screen when I click the inner pages.

I tried by disabling the seo url in conf_global.php

  'use_friendly_urls' => '1',

to

  'use_friendly_urls' => '0',

Still same issue. Then I disabled the seo url by login into admin > Search Engine Optimization

I created .htaccess with following and upload to ib4 folder

<IfModule mod_rewrite.c>
Options -MultiViews
RewriteEngine On
RewriteBase /ib4/
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule \.(js|css|jpeg|jpg|gif|png|ico|map)(\?|$) /ib4/404error.php [L,NC]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /ib4/index.php [L]
</IfModule>

and then I enabled the seo url from admin area.