Upgrade to 4.5

I HAVE MY CUSTOMIZED DB WHICH IS UPGRADED TO 4.3 NOW FROM 3.8.
NOW WHILE RUNNING THE LATEST SOURCE 4.5.3 , WHICH OPTION IS BEST

OPT 1:   RUN SOURCE, ON INTSALLATION WINDOW , GIVE THE EXISTING DB DETAILS ,
OPT 2:  ADD APPSETTINGS.JSON AND PLUGIN.JSON MANUALLY AND THEN RUN SOURCE. IN THIS APPROACH IS THE UPGRADE QUERY WILL EXECUTE OR NOT??

ANYBODY SPECIFY WHICH IS BEST APPROACH TO AVOID BUGS

1. Run install and create a test database
2. Check the system is operating correctly
3. Edit appsettings.json and point to v4.3 database
4. Run website to migrate the database to v4.5
- If errors check the std_error log
- See https://www.selectsystems.com.au/checking-for-errors-on-a-new-installation-of-nopcommerce
5. Ensure system is running on upgraded database
6. Install 3rd Patry Plugins

4. Run website to migrate the database to v4.5

HOPE MIGRATION WILL AUTOMATICALLY TAKEN WHILE RUNNING

You can also check Windows System Event Logs

You probably have a security / connection issue with the database
How are you running in Visual studio or Production ?
If IIS Have you set the security access on the database

i am running from vs 2022.

the approach yu said is worked for me for 4.3

while running 4.5 , page not displayed error is coming

app not running perfectly. logs are also empty

What is the error ?

is there an upgrade path from 4.3 to 4.5 through Visual Studio with NuGet?

Hi
to upgrade you need to install some SDK which is required for the latest .Net version
using VS Nuget maybe it can be build success as some of software required to install

please check this doc. and link it may be helpful for you
https://docs.nopcommerce.com/en/installation-and-upgrading/upgrading-nopcommerce.html
https://www.nopcommerce.com/en/boards/topic/92682/upgrade-42-to-45
https://www.nopcommerce.com/en/boards/topic/95167/upgrade-from-43-to-45

Using this you may get more idea regarding upgrade

RE: "upgrade ... through Visual Studio"
Upgrade what?
Get Visual Studio 2022.
Get the source code version of nopCommerce 4.50.x
If you have custom code in your 4.30 version, you will need to upgrade/merge it into the 4.50 version.
(Use a Diff tool to see the types of changes that the core team did)