I would first make sure the database conversion from PostgreSQL to MySQL/MariaDB was successful.
I don't believe you would have problems with Apache, however you don't mention which version you currently have.
For the PHP version, you could use a version that works for both and meets the minimum requirements for 3.3.x, like PHP 7.2. After the phpBB upgrade you could use a higher PHP version.
grover_d wrote: ↑Fri Jan 14, 2022 8:27 pm
Can I backup my forums on 3.2.7 via the phpbb3 backup process and then install phpBB3 3.3.5 and restore the data?
No, you need to upgrade the database.
https://www.phpbb.com/support/docs/en/3 ... upgrade32/
You will run into issues by having database and files for different versions.
I always wonder why people think it would be that easy, and I'm not trying to be rude, it's a genuine doubt.