Hello,
1) Compatibility issues with the Measurement Price Calculator plugin were fixed. We did not get new requests about that. So, it should work.
2) You can use email data export/import to export email template and import to the new one https://www.awesomescreenshot.com/image/24387456?key=f03072b4133cbd0f57907ca0c3aceb2f
3) Firebird plugin comes in the full version. We do not include WooCommerce Subscriptions https://woocommerce.com/products/woocommerce-subscriptions/ , we include Subscriptio https://codecanyon.net/item/subscriptio-woocommerce-subscriptions/8754068
Regards
Regards