NOTE: Before proceeding, make sure your computer can read .ZIP files!
Windows XP, Vista, and 7 have built-in utilities to read and extract ZIP files. There are also other free programs available online that can be used. Mac OS and Linux users can extract the .TAR.GZ files using their built-in archiving tools. This article covers installing the program on Windows PCs. For help installing on Mac OS or Linux, please visit the Skyscraper Simulator Forum.
This may be the most confusing part of the whole installation process, but it is very easy. Open the file you downloaded, and click on "Extract All Files". For easy program access, make a folder on your desktop and extract the program to that folder. (See pictures below for additional assistance)
Once everything has extracted, open up the folder and find the program. If it launches without a problem, then you're done! Enjoy the program! Otherwise, visit the Troubleshooting page for additional help.