Can't install user plugin

When I try to install the user plugin, I get the error below.
How do I solve this?

I'm working on localhost.
Joomla: 3.8.12
PHP: 7.0.8 (Xampp on Ubuntu 16.04)
Database Version: 5.5.5-10.1.13-MariaDB
Database Collation: utf8_general_ci
Database Connection Collation: utf8mb4_general_ci

---

Warning
JInstaller: :Install: Error SQL You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '(`id`) ) ENGINE=InnoDB' at line 6
Extension Install: SQL error processing query: DB function failed with error number 1064
You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '(`id`) ) ENGINE=InnoDB' at line 6
SQL =

CREATE TABLE IF NOT EXISTS `#__sr_customfield_values` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`context` text NOT NULL,
`value` text NOT NULL,
`storage` text
PRIMARY KEY (`id`)
) ENGINE=InnoDB;

That relates to a table for customfields - that plugin has been updated now, so download that and install it first, then try again.

Sorry, I forgot to mention - there's a solidres upgrade as well - to v2.7.1