Hey Drik,
I have help you upgraded to Easyblog 5.x ,
To fix this, temporary manually added this following new columns in your database.
// Replace the #_ with your table prefix
ALTER TABLE `#__easyblog_acl` ADD `group` varchar(255) NOT NULL;
ALTER TABLE `#__easyblog_post` ADD `state` int(1) unsigned NOT NULL;
ALTER TABLE `#__easyblog_post` ADD `locked` tinyint(3) NOT NULL;
ALTER TABLE `#__easyblog_post` ADD `doctype` varchar(255) NOT NULL;
ALTER TABLE `#__easyblog_post` ADD `revision_id` bigint(20) DEFAULT '0';
ALTER TABLE `#__easyblog_users` ADD `custom_css` text null;
After installation successfully, go to
backend > Easyblog > maintenance > click `database` > run .
The last step
backend > Easyblog > maintenance > click `script` > select all > click "execute script"
Everything is working fine now.