The installation process may delete or overwrite files from previous installations.
It includes languages files, scripts, toolbar images, etc. except the xml configuration file.
If you added yourself a language file, a toolbar image, a script, etc. it will not be modified or delete by the installation/uninstallation.
You will maybe have to move it if you upgrade from a version prior to 3.3 because now the files are separated into subfolders (Languages, Scripts, Templates, Toolbars).
If you modified files but are not sure if they are default files, I recommend to make a backup copy of the folder where you installed the program before upgrading to the new version.
Also, do not forget to OFTEN BACKUP YOUR CATALOGS; especially before upgrading to a new version, but doing it often may be useful anyway ;)
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License information
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, EXPRESSED, IMPLIED OR OTHERWISE, INCLUDING AND WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR OR HIS COMPANY BE LIABLE FOR ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES WHATSOEVER (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF PROFITS, BUSINESS INTERRUPTION, LOSS OF INFORMATION, OR ANY OTHER LOSS) , WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR INABILITY TO USE THIS SOFTWARE.