I have upgraded using upgrade scripts Nop 3.6 to 3.9 but there were two problems.
1) Table for Store pickup point was missing.
2) Shipping.FixedOrByWeight plugin not working.
First one i have solved by creating the table using the following script in SQL
USE [DATABASE NAME]
/****** Object: Table [dbo].[StorePickupPoint] Script Date: 4/25/2017 4:07:54 PM ******/
SET ANSI_NULLS ON
SET QUOTED_IDENTIFIER ON
CREATE TABLE [dbo].[StorePickupPoint](
[Id] [int] IDENTITY(1,1) NOT NULL,
[Name] [nvarchar](max) NULL,
[Description] [nvarchar](max) NULL,
[AddressId] [int] NOT NULL,
[PickupFee] [decimal](18, 4) NOT NULL,
[OpeningHours] [nvarchar](max) NULL,
[StoreId] [int] NOT NULL,
PRIMARY KEY CLUSTERED
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
Plz help me with the second one.
Thanks in Advance