Practising the Piano

From the dust jacket notes: "This book is the fruit of a lifetime of experience as a teacher and it has grown out of the advice which Mr. Merrick has been in the habit of giving to his pupils. Although no text-book can ever be a substitute for the presence of an inspiring teacher, this particular book is distinctively personal. Those who have learned from Frank Merrick will almost hear his voice beside them. And as far as advice handed down orally from teacher to pupil goes, the advice is of excellent pedigree. For Leschetizky, Merrick's master, learnt from Czerny, who in turn learnt from Beethoven."

Extract RAR5 archives

The majority of unpackers do not support the new RAR5 format. You will receive an error message when you try to open it, and there is usually no way to integrate it manually into the application to add support for it.

So, the only feasible option right now is to install Winrar 5.x on your system if you want to use a graphical user interface. Note that this is a trial version, and while it won't stop working after the trial runs out, it will nag you to upgrade the software.