How to populate schema and connect windchill to new database

Hello Experts, 

I have windchill 12 with sqlserver database, i have dropped the existing database and created new one dolling this article:

https://www.ptc.com/en/support/article/CS28197

I understand that after that i should run PSI and point to newly created database to populate schema and plug in windchill with it, however when i run PSI i dont see any opion that says update existing database or something similar!!, any Idea?

Regards, 

Youssef