In openSIS, due to the change in the database engine from ISAM to InnoDB, it takes a long time for the script to run and create the openSIS database. Most users who are trying to install the system on their computer are getting a blank screen after the database connection page.
The solution to that is:
1. Open the php.ini file in your PHP folder and search for max_execution_time.
2. When you find it, increase it to 3600 and save the file.
Maximum execution time of each script, in seconds, i.e. ; max_execution_time=3600
3. Then restart Apache.
4. Try openSIS installation again.
For PHP reference, visit this URL http://php.net/max-execution-time
Note: This directive is hardcoded to 0 for the CLI SAPI