Download
ImpressPages CMS 3.0 (possible IE issues)
ImpressPages CMS 2.6 (recommended)
ImpressPages CMS 1.0.16
For older version you can visit https://sourceforge.net/projects/impresspages/files/
GIT
If you use Linux command line, GIT hub is ready for you.
After download...
ImpressPages installation and update process is very self-explaining. If you find any problems, please visit our documentation or forum.
Here you can find a list of PHP 5.3 hosting companies.