Susanne, by any chance is there a website address at the top or bottom of any of the pages of the assembly instructions? If so, I suggest you go directly to the website. Many times manufactures of incubators and brooders will have technical support information somewhere on their website.
Failing that, perhaps you can talk to the place you purchased it from. Was this an online purchase? If so, return to that website and see if they have a technical support section. They may even have a live support chat room where you could get help.
When all else fails......GOOGLE!!!
And remember, with Google, it's not what you ask for, it's how you ask for it. If you don't get what you want right away, try making your request for information in another way. i.e. enter: Rcon Incubator Assembly Instructions....Or, you could try: How to put together an Rcon Incubator. Try it several different ways until you get what you want. I rarely get something the first go-round with Google. It's all in how you phrase your request.
Good luck, and let us know how it goes. You never know when the information you find might help someone else...especially when you provide a link to that information!