Change directory to your Tikiwiki parent directory (for instance, if your Tiki is installed at /home/user/public_html/tikiwiki-1.8 then your parent directory would be /home/user/public_html)
Download the 1.8.1 release from the link above
Copy your old Tiki directory to "tikiwiki-1.8.1" (you can "move" it instead to save disk space, but doing a "copy" instead gives you a backup) - cp -r tikiwiki-1.8 tikiwiki-1.8.1
Move the old Tiki directory out of the way - mv tikiwiki-1.8 tikiwiki-1.8_backup
Unpack the new archive (pick one of the following depending on which file you downloaded):
bzip2 -dc tikiwiki-1.8.1.tar.bz2 | tar xf - (for the .tar.bz2 file)
gzip -dc tikiwiki-1.8.1.tar.gz | tar xf - (for the .tar.gz file)
unzip tikiwiki-1.8.1.zip (for the .zip file)
Clear the Smarty compiled templates so that the updates all work properly - rm -rf tikiwiki-1.8.1/templates_c/*
(Optional but recommended) Move your new Tiki directory back to where the old one was, so your links don't break - mv tikiwiki-1.8.1 tikiwiki-1.8
There are no other updates or SQL scripts to run, so you're done
Note: Tiki customizations (style sheets, etc) will have to be migrated manually
Resolved bugs and misbehaviors since 1.8.0
File and Image Galleries: Directory value shouldn't need "/"
Forums : Show posts by age sorting broken
Wiki Split! (both the @@@ and the line breaks in columns)
forum attachment doesn't work
Taglines uploaded display with escapes
Shoutbox module's delete link doesn't work everywhere
WikiSyntax : Center- if colon in-line, centering breaks
search_box with Fulltext Search
Misspelled link in file /lib/calendarlib.php
Incorrectly specified wiki 'h4' heading
Blog Pagination links were out of sync
moreneat debug console has hard to see colours
Forums : individual RSS feeds not working
RSS not properly processing blogId
FANCYTABLE plugin generates wrong TD format
RSS feeds are sent with Wiki Formatting instead of HTML
RSS feed brakes in 1.8 RC3 - httprequest() in tikilib didnt return any data
Newsletters: Subscribers get same unsubscribe code
File Gals:IIS REQUEST_URI not set in file download
lastLogin was the same as currentLogin
ARTICLES plugin wasnt showing the topic images.
mod-who_is_there Fixed missing quote marker
commzone/attzone area JS flip link fixed for all themes (comments and attachments weren't staying to show in Konqueror) with more accessible solution
Contact Anonymous fixed remember to enabled the Contact Us and user Messaging features, set a contact name on Admin->General and let anonymous use the messaging system permission
Integrator that was unable to save new repository
iframe width in featured-link feature
Wiki quick help SQL plugin documentation
breaks in the BOX plug-in
missing ?forumId= in tiki-forum(s)_rss.php
SPLIT and BOX plugins to render all wiki syntax properly
diff and source view to display special characters properly
external RSS feeds: first entry was not shown
more XHTML fixes (some ported from 1.7.x branch)
Corrected the alignment in neat theme for wiki page icons
New Features and changes
en-uk Language file, mainly because we british love our colour