From the pages of Barbara Brackman's Encyclopedia of Pieced Quilt Patterns, BlockBase+ brings over 4,000 quilt blocks to your computer screen. Barbara's decades of research are available to you in this user-friendly software for Windows and Mac computers. Packed with complete publication information for each block, robust search features, exporting and printing capabilities. The perfect quilting tool for all skill levels! Customers receive both Mac and Windows versions of BlockBase+ upon purchasing. BlockBase+ is a standalone program. This package contains a single-user license and instructions for download and installation. Claimed software cannot be returned or refunded. Once you claim this software, whether you have downloaded and installed or not, you are considered the registered owner. Made in the USA.