insnwd.sql is not a working code ( Jan 2022)

Any time I attempt to download or even copy and paste the code in to SSMS I end up with an error.
Below is the error message I receive. I am new to this and do not know how to fix this and it appears that I would have to do so because of frequent syntax errors. What do I do now?

Error Message:
Msg 102, Level 15, State 1, Line 1
Incorrect syntax near '.'.
Msg 3702, Level 16, State 4, Line 13
Cannot drop database "Northwind" because it is currently in use.
Msg 1801, Level 16, State 3, Line 15
Database 'Northwind' already exists. Choose a different database name.
Msg 3726, Level 16, State 1, Line 113
Could not drop object 'dbo.Customers' because it is referenced by a FOREIGN KEY constraint.
Msg 2714, Level 16, State 6, Line 175
There is already an object named 'Customers' in the database.
Msg 1913, Level 16, State 1, Line 193
The operation failed because an index or statistics with name 'City' already exists on table 'dbo.Customers'.
Msg 1913, Level 16, State 1, Line 195
The operation failed because an index or statistics with name 'CompanyName' already exists on table 'dbo.Customers'.
Msg 1913, Level 16, State 1, Line 197
The operation failed because an index or statistics with name 'PostalCode' already exists on table 'dbo.Customers'.
Msg 1913, Level 16, State 1, Line 199
The operation failed because an index or statistics with name 'Region' already exists on table 'dbo.Customers'.

Open insnwd.sql and run it in SQL Server Management Studio while reviewing the reported errors, especially the syntax error and the Northwind database and object conflicts. Reproduce the failure and identify the script changes needed for it to execute without the listed errors.