I think Paul sells the CD version for around $45, it includes:
High_Resolution_TheExpertsBook_revA.pdf - This is the high-resolution PDF of The Expert's Book. Although a large file (155 MB), it is scanned at 600 d.p.i. and provides the highest quality file. Suitable for desktop or laptop computers.
Optimized_TheExpertsBook_revA.pdf - This is an optimized version of The Expert's Book. Scanned at a lower resolution (150 d.p.i.), it is a much smaller, performance orientated file ( 20 MB). It is suitable for lower powered devices such as tablets or smartphones.
Printable_Wooksheet_revA.pdf - This is a printable version of the worksheet found in The Expert'sd Guide. Once printed, it can be used as you undertake your examination of individual stamps.
The PDFs are fully searchable.