What you experianced was a sales person needing to make a sale. They will promise and then they hope the programmers/techs will deliver. It's very common for so

What you experianced was a sales person needing to make a sale. They will promise and then they hope the programmers/techs will deliver. It's very common for software sales, in any field, to do this. Here's another common got you. They will sell you the software very cheaply and get you to use it in your business. Once the software becomes an important part of your business they will sell you upgrades at many times the original price. At which time you'll have to choose between upgrading or dealing with old buggie software. Switching to another vendor won't be an option since it will be much more expensive than the upgrade. They have you. There are just too many unknowns to say that just because it works in one model it will be a quick change for another model. It sounds like the mods are for very specialized software so most likely you have no choice but to work it out with them. Look for alternatives but I dought there are any. They probably understand their competitors enough that they know that saying no to you is a safe bet. Your job now is to lay down some options for your boss and let him choose. It's very important that you don't hide anything from him. He needs to know and understand everything. It's just life. We can't always get 100% of what we want.