Hello,
You purchase one time HikaSubscription (and enjoy one year of help and unlimited help) but you don't have to upgrade (and so purchase it each year).
Now, if some update have to be done to your website as Joomla, HikaShop or Php maybe you will have to use the last HikaSubscription versions, but we aren't be able to tell you when in the future, you will have to update.
We have find the issue in your MassAction, unfortunatelly in your Filter you have this :
order_product_height = DATE_FORMAT(CURDATE(), "%Y%m%d")
The design of a MassAction can't process an "operation" in your searching value, here, DATE_FORMAT(CURDATE(), "%Y%m%d"), this will only search and compare found value in your DataBase.
So far we didn't see how you can search a dynamic value without some development or use HikaSubscription.
regards