I took a quick look at the file and my links worked fine.
Make sure you extract the zip files together into the same folder, preferably named the same as the original folder. That might be part of your problem. Also, your computer my not be allowing the macros to run (even without asking) depending on the security software and the security levels you have set. If the macros don't run, the software doesn't work properly. You should be getting a popup when you first open the spreadsheet asking if you want to enable the macros. The correct answer is yes.
After looking at the spreadsheets, there will have to be a lot of modifications to the information to work in your area such as tax rates by city and updating the pricing for the materials based on your supplier. If you are not adept at Excel, this may be an overwhelming task for you and you may want to reconsider. If you want to use this as a learning experience, then follow the caveat above and double check the estimates by hand.
Good Luck
