CRM PRO
There can be many reasons
If you have installed the worksuite on domain example youdomain.com and files are placed in folder named as public_html.
Check your database has not any tables. If you have any database tables then drop existing database tables.
With the SaaS version you charge customers/companies for using the services
To be able to start the installation at all, you must set appropriate permissions for storage folder and it's subfolders.
To update to a new version of the Application follow these steps in sequence.
Chagelog for CRM Pro
Update CRM Pro Manually