Simply put it means what it says. That the Simple:Press version contained in the database is newer than the actual software version you have installed.

This, I take it, is as a result of a restore of a database backup that is newer than the restore of your site software backup. Simple:Press can’t be upgraded under these conditions as the database (where any upgrade tasks take place) has already been upgraded.

Your best course of action is to download the most recent Simple:Press and then use ftp to overwrite the version installed on your server. You really ought to do this for any SP plugins and themes you are using as well. Otherwise there may be a discrepancy between what the code and database expect.

Will this wipe out all previous topics and content in the forum?

No you are quite safe. All your forum data is in the database. You are only replacing the program code with up to date versions.

Thats great to hear! Was afraid it would all be gone.

So, I download the newest version of simple:press and replaces it with the old via ftp? After that I download all plugins and theme and replace those as well. All in that order?

I succeded in replacing with the newest version but now I am getting this error as shown here: http://tiny.cc/axt5hw

That’s OK. Now just go to the admin an click on the upgrade against the forum. Just means it wasn’t the very latest version you were running before but was still later than the DB backup.

After uploading the new version it showed the forum without asking me to upgrade. Now I am getting this 

Warning: preg_replace_callback() [function.preg-replace-callback]: Empty regular expression in /problem-with-post-edit-buttonome/soelvinv/public_html/wp-content/plugins/simple-press/sp-api/sp-api-filters.php on line 1044

Whoops! Sorry about that. This is a little bug I left in the code I am afraid.
If you could go to your WP admin > Settings > Writing and turn ON the option to convert emoticons (In formatting section at top) then this error will go away. The next update – which will be soon – will correct that and you can turn the option off again if you would rather have it off.
Again- apologies.

No problem at all YS. Thanks for your help. Everything works perfect now.

np, glad we could help.  thanks for the update…