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Research

Looks like current_user_can(‘manage_slp’) is not returning true in \SLP_Actions::init()

manage_slp cap is added by \SLP_Admin_Activation::update()
Looks like that method is not being called.

This logic is FUBAR… do not install main table or extended table or add roles and caps on a NEW install?!?!

	/**
	 * Update the plugin.
	 */
	public function update() {
		if ( $this->being_deactivated() ) {
			return;
		}

		// -- Update prior installation data
		if ( ! empty( $this->slplus->installed_version ?? '' ) ) {

			// Not multisite
			if ( ! is_multisite() ) {
				$this->copyr( SLPLUS_UPLOADDIR . 'css', SLPLUS_PLUGINDIR . 'css' );
				$Upgrade = SLP_Admin_Upgrade::get_instance();
				$Upgrade->migrate_settings();
			} else {
				$this->multisite_upgrade_options();
			}

			// Update Tables, Setup Roles
			$this->install_main_table();
			$this->install_ExtendedDataTables();
			$this->add_slplus_roles_and_caps();

			if ( ! defined( 'MYSLP_VERSION' ) ) {
				$this->check_for_addon_updates();
			}

			// -- Fresh install
		} else {
			/* @var SLP_WPOption_Manager $optionManager */
			$optionManager = SLP_WPOption_Manager::get_instance();
			$optionManager->update_wp_option( 'nojs' );
			$optionManager->update_wp_option( 'js' );
		}

		update_option( SLPLUS_PREFIX . '-installed_base_version', SLPLUS_VERSION );
	}

Development

Updated the update method noted above:

	/**
	 * Update the plugin.
	 */
	public function update() {
		if ( $this->being_deactivated() ) {
			return;
		}

		// Update Tables, Setup Roles
		$this->install_main_table();
		$this->install_ExtendedDataTables();
		$this->add_slplus_roles_and_caps();

		// -- Update prior installation data
		if ( ! empty( $this->slplus->installed_version ?? '' ) ) {

			// Not multisite
			if ( ! is_multisite() ) {
				$this->copyr( SLPLUS_UPLOADDIR . 'css', SLPLUS_PLUGINDIR . 'css' );
				$Upgrade = SLP_Admin_Upgrade::get_instance();
				$Upgrade->migrate_settings();
			} else {
				$this->multisite_upgrade_options();
			}

			// -- Fresh install
		} else {
			/* @var SLP_WPOption_Manager $optionManager */
			$optionManager = SLP_WPOption_Manager::get_instance();
			$optionManager->update_wp_option( 'nojs' );
			$optionManager->update_wp_option( 'js' );
		}

		update_option( SLPLUS_PREFIX . '-installed_base_version', SLPLUS_VERSION );

		if ( ! defined( 'MYSLP_VERSION' ) ) {
			$this->check_for_addon_updates();
		}
	}