Site in sub-folder not working

Hi,

Before moving old website to Oldy folder, have you changed the Home URL and Site URL from the dashboard?

Nope ??
Too late now? Any alternative option?

Thank you!

Try the Edit functions.php method on https://codex.www.ads-software.com/Changing_The_Site_URL – it worked for me when I had a very similar problem

@daneshi
I did that but I get a blank page when visiting
https://www.hetgewildewesten.nl/Oldy/wp-login.php or wp-admin…

@daneshi
i got it… you mean functions.php in the theme files.. ok but now i get redirected to this address:

https://www.hetgewildewesten.nl/wp-admin/my-sites.php

and I get this message:

“Multiwebsite ondersteuning is niet geactiveerd.”

I also tried this:
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Changing the URL directly in the database
If you know how to access phpMyAdmin on your host, then you can edit these values directly to get you up and running again.

Backup your database and save the copy off-site.
Login to phpMyAdmin.
Click the link to your Databases.
A list of your databases will appear. Choose the one that is your WordPress database.
All the tables in your database will appear on the screen.
From the list, look for wp_options. Note: The table prefix of wp_ may be different if you changed it when installing.
Click on the small icon indicated as Browse.
A screen will open with a list of the fields within the wp_options table.
Under the field option_name, scroll down and look for siteurl.
Click the Edit Field icon which usually is found at the far left at the beginning of the row.
The Edit Field window will appear.
In the input box for option_value, carefully change the URL information to the new address.
Verify this is correct and click Go to save the information.
You should be returned to your wp_options table.
Look for the home field in the table and click Edit Field. Note There are several pages of tables inside wp_options. Look for the > symbol to page through them.
In the input box for option_value, carefully change the URL information to the new address.
Verify this is correct and click Go to save the information.
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but I get an error message about redirection issue

nothing on WP documentation helped nor forums

However I have solved it thanks to a nice video tutorial from …….com ??

thank you anyway