Mandatory information about my setup:

Have I searched the tickets before posting? yes
Have I searched the forum before posting? yes
Have I read the documentation before posting (which pages?)? yes
Joomla! version: (2.5.11)
PHP version: (unknown)
MySQL version: (unknown)
Hotspots version: (unknown)
Direct link to the page that shows the issue: http://dp2.apache07.hostbasket.com/wolfcarius/index.php/nl/?Itemid=170


Description of my issue:
I tried to install the latest version of hotspots but it failed.
Then I tried to uninstall the previous version which worked, but I still can not install the latest version. When the files have uploaded I get a blank screen and nothing more.
There is noting installed.