Plugin couldn't be installed because of: Error importSQL::ModelOSM
google_login/model/struct.sql
1215 - Cannot add foreign key constraint

Are you using MariaDB?

It runs perfect under MariaDB.

Thank you,

Plugin couldn't be installed because of: Error importSQL::ModelOSM
google_login/model/struct.sql
1215 - Cannot add foreign key constraint

Please share with us the error log.

How can I convert from existing DB to mariaDB?

Find error log in the attachment

First, you must install it on Osclass, not wordpress.
Problems with foreign keys are usually related to MariaDB than Mysql.

When I try to install Google Login Plugin it shows following error:

Plugin couldn't be installed because of: Error importSQL::ModelOSM
google_login/model/struct.sql
1215 - Cannot add foreign key constraint

I am installing it on osclass not on wordpress.
Screenshot is attached.

Open struct.sql, use your db prefix and try to run on your db to identify which foreign key is problem