To update Listimia theme do the following steps:
Step 1:
First of all make a backup of all the customized theme files, so you can recover it and redo all changes at any time.
Step 2:
Download the latest theme version and extract the package to your Desktop.
Step 3:
Using your FTP program, upload the content of the "UPLOAD" folder to your phpMyDirectory root directory (where index.php is located).
Step 4:
After successful upload, you should go to your admin panel Plugins -> Listimia_options and click Refresh link from left side menu.
Step 5:
Redo your changes by merging your customized files with the new ones.