9.6.3 Can you answer these questions?

9.6.3.1 How to add spacing between the title, author and logo on book cover spine?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=672361

I'm using the bookcover package for this. 
Here's my MWE: 
\documentclass[ 
spinewidth=1cm, 
markcolor=black,]{bookcover} 
\usepackage{graphicx} 
\graphicspath{{../images}} 
\usepackage{float} 
\... 
[bookcover]
 

asked by Maniel Sotomayor https://tex.stackexchange.com/landing/r/digest?cta=user&id=288079 Score of 1

9.6.3.2 How to automatically create an appropriate amount of horizontal space between a title and a page number in the table of contents when using svmono?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=672257

Feeding 
\documentclass[deutsch]{svmono}% taken fromhttps://resource-cms.springernature.com/springer-cms/rest/v1/content/20566/data/monographs 
\usepackage[T1]{fontenc} 
\usepackage[ngerman]{babel} 
\... 
[table-of-contents] [sv-classes] [lastpage] [horizontal-spacing]
 

asked by Albert Nash https://tex.stackexchange.com/landing/r/digest?cta=user&id=282514 Score of 1

9.6.3.3 Error missing   inserted with align*

https://tex.stackexchange.com/landing/r/digest?cta=question&id=672799

EDIT: Given the comments I will rewrite my question from scratch and provide a solution for it. It can be useful for some people. 
I get an error missing } inserted end{align*} if I use the following ... 
[equations] [align] [labels] [tag]
 

asked by gatsu https://tex.stackexchange.com/landing/r/digest?cta=user&id=288928 Score of 1

answered by gatsu https://tex.stackexchange.com/landing/r/digest?cta=user&id=288928 Score of 0