It has been shared on this forum a few times in the past, but if I recall correctly, expiring download links were used.
The author of this book, Mike Rivers, passed away a few years ago. While some might think that this turns anything created by him into a free-for-all for everyone else, technically, the family of a diseased person usually manage the "estate" of the family member, which typically also includes their intellectual rights (such as books they have written).
(I have been dealing with "online shops" for content in the past, and we had a content creator pass away... and then had to deal with the "estate" for revenue the content created after his death, etc. So, the content didn't just become free, because that creator died. It's usually more complicated than that).
In other words - while it's always meant well, when someone shares that book here, technically, they could still get in trouble for it - which is why I would never personally publicly upload copyrighted material like that.
My suggestion would be, to find posts where that book was previously shared, and then send a Direct Message to the person who shared it, to see if they can send it to you, directly (so there's no public record of it).
...but who knows... maybe someone else on here will read this and want to prove me wrong by uploading the manual somewhere
I kinda hope so...
Sorry, I'm sure that this is not what you wanted to hear, but I suspect that the above is the reason why requests for this book on this forum, are often met with silence.
(I played a few shows in Belgium a few years back in Gent (Asgaard) and Bree (Ragnarok) as part of a European tour. We had a great time, there. Especially Asgaard was awesome... great people there!! ...and I think I went to "Walibi Belgium" like, over 20 years ago. Exactly one day before people got stuck on top of that single-loop roller coaster for hours that was in the news internationally. I felt pretty lucky, hahaha).