I used New Print Image and then Define Motif Size and the results were not right. If not, click back and forth between your new print image and other images on screen 'til Photoshop wakes up. There is no library. You can create any broadcloth, twill, satin, herringbone, chevron or custom weave pattern you want. Create dobbies and jacquards with the help of Photoshop's Layers and selection tools.
All gauges print out to exact size and proportion.
And measurements can always be entered as decimals or fractions. If you're designing large prints or full-size sweaters you will find 64 MB inadequate. 128MB or more would serve you much better. If you currently have 64 MB you should be able to use every program successfully, so there is no need to upgrade your RAM before downloading the demo version. But don't hold your breath because it isn't even close at this point.