Problems downloading and "opening" our materials can usually be solved with one of the following "fixes" --
Upgrade your browser
This fixes most problems people may have with opening our files. Why? Because older browsers sometimes have a problem opening big files. Upgrades are FREE and can be downloaded with the following links:
Our books and worksheets are in "PDF" format, which requires that you have something called a "PDF reader."
Most computers already have a PDF reader, but in case yours doesn't (or maybe the PDF reader needs to be re-installed or upgraded) here are links to the two most popular PDF readers. Both are FREE.