Can’t activate UM plugin

Hi!

I can’t activate the Ultimate Member plugin. I tried with WP 8.6 and UM 2.10.2.

I download the plugin and unpack it to the ../wp-content/plugins directory through the console.

When I try to activate the plugin on the plugin pages list, WP redirects me to the page with FTP/SFTP fields.

As I understand, this occurs because the plugin needs to write to some files/directories, but can’t.

I set the owner of the wp-content directory to www-data. But this takes no effect. I tried to set the owner of the plugin directory (plugins/ultimatemember) to www-data too, but this takes no effect too.

There were no errors with the 2.8.6 version of the plugin, I used before.

I can set the define(‘FS_METHOD’, ‘direct’); instruction in the wp-config file and this solves the problem, that’s why I think that the problem is due to access rights. But I don’t understand what paths I should open for writing in additional to wp-content and this plugin directory. I don’t want to use this instruction in the wp-config file because this reduces the site protection.

Сan you tell me which directories still need to be opened for writing to www-data so that the plugin can work properly?