Same here. Rollback works, you find the old version here if you dont know where to find it: https://downloads.www.ads-software.com/plugin/bambora-online-checkout.7.0.0.zip
My error message:
Error Details
==================
An error of type E_ERROR was caused on line 2383 in the file /mysite/wp-content/plugins/bambora-online-checkout/bambora-online-checkout.php. Error message: Uncaught Error: Failed opening required '/mysite/wp-content/plugins/bambora-online-checkout/bambora-online-checkout-blocks.php' (include_path='.:/usr/share/pear/php:/usr/share/php') in /mysite/wp-content/plugins/bambora-online-checkout/bambora-online-checkout.php:2383
Stack trace:
#0 /mysite/wp-includes/class-wp-hook.php(324): bambora_online_register_order_approval_payment_method_type('')
#1 /mysite/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array)
#2 /mysite/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#3 /mysite/wp-content/plugins/woocommerce/src/Blocks/Domain/Bootstrap.php(93): do_action('woocommerce_blo...')
#4 /mysite/wp-content/plugins/woocommerce/src/Blocks/Package.php(124): Automattic\WooCommerce\Blocks\Domain\Bootstrap->__construct(Object(Automattic\WooCommerce\Blocks\Registry\Container))
#5 /mysite/wp-content/plugins/woocommerce/src/Blocks/Registry/AbstractDependencyType.php(42): Automattic\WooCommerce\Blocks\Package::Automattic\WooCommerce\Blocks\{closure}(Object(Automattic\WooCommerce\Blocks\Registry\Container))
#6 /mysite/wp-content/plugins/woocommerce/src/Blocks/Registry/SharedType.php(28): Automattic\WooCommerce\Blocks\Registry\AbstractDependencyType->resolve_value(Object(Automattic\WooCommerce\Blocks\Registry\Container))
#7 /mysite/wp-content/plugins/woocommerce/src/Blocks/Registry/Container.php(96): Automattic\WooCommerce\Blocks\Registry\SharedType->get(Object(Automattic\WooCommerce\Blocks\Registry\Container))
#8 /mysite/wp-content/plugins/woocommerce/src/Blocks/Package.php(44): Automattic\WooCommerce\Blocks\Registry\Container->get('Automattic\\WooC...')
#9 [internal function]: Automattic\WooCommerce\Blocks\Package::init()
#10 /mysite/wp-content/plugins/woocommerce/src/Packages.php(128): call_user_func(Array)
#11 /mysite/wp-content/plugins/woocommerce/src/Packages.php(64): Automattic\WooCommerce\Packages::initialize_packages()
#12 /mysite/wp-includes/class-wp-hook.php(324): Automattic\WooCommerce\Packages::on_init('')
#13 /mysite/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array)
#14 /mysite/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#15 /mysite/wp-settings.php(550): do_action('plugins_loaded')
#16 /mysite/wp-config.php(124): require_once('/nas/content/li...')
#17 /mysite/wp-load.php(50): require_once('/nas/content/li...')
#18 /mysite/wp-admin/admin.php(34): require_once('/nas/content/li...')
#19 /mysite/wp-admin/index.php(10): require_once('/nas/content/li...')
#20 {main}
thrown