This is the error message that I get now

Fatal error: Uncaught exception 'PharException' with message 'phar "/var/www/vhosts/efca.net/ufptest.efca.net/cmsms-2.0-install.php" SHA1 signature could not be verified: broken signature' in /var/www/vhosts/efca.net/ufptest.efca.net/cmsms-2.0-install.php:8 Stack trace: #0 /var/www/vhosts/efca.net/ufptest.efca.net/cmsms-2.0-install.php(8): Phar::webPhar(NULL, 'index.php') #1 {main} thrown in /var/www/vhosts/efca.net/ufptest.efca.net/cmsms-2.0-install.php on line 8
This was solved by uploading the install file via the control panel rather than via Filezilla. Anyhow, next problem is that it seems that I cannot upgrade from Isabela to 2.0
Although an installation of CMS Made Simple was found, it is not possible to upgrade this version using this application. The version may be too old.
Your current working directory: /VAR/WWW/VHOSTS/EFCA.NET/UFPTEST.EFCA.NET
Your version: 1.11.2.1 (ISABELA)
Database Schema version: 36
Approximate installation date: 10/30/2012
So how can I upgrade? (I will try first to go to 1.12.2 now)
Thanks