Problem installing phpbb on lemp. "Access denied"?

Question

linux

Uploaded the contents of the archive to the local directory of the server.
I entered the server ip in the browser, got this:

php info was displayed correctly at the same address, it also works fine in the phpMyAdmin browser. The server is working fine, so the problem is in the phpbb installation itself.
Then I gave permissions to:
"Change the permissions on config.php to be writable by all (666 or -rw-rw-rw- within your FTP Client)
Change the permissions on the following directories to be writable by all (777 or - rwxrwxrwx within your FTP Client):
store/, cache/, files/ and images/avatars/upload/."
According to the installation instructions.
Also tell me, should these rights be given only to directories like store/ or should they be given recursively, that is, store/ itself and all its contents should have rights 777?
(I didn't recursively grant permissions).

In general, after the issuance of rights, the situation has not changed and the same hangs: "Access denied.". When you type " http://*ip*/install/app.php
" into the address bar, it displays on a white background: "File not found. ". What else can be done to solve the problem? How to get access to the installer? I am 90% sure that the problem is in incorrectly issued file permissions (for the test, I issued 777 recursively for all phpbb content, I got the installer page, but with many errors). Maybe someone installed phpbb recently,