On Sat, Dec 26, 2020 at 04:39:36PM +0100, michael-franzese@gmx.com wrote:
> 
> Would like to install modus-themes-1.0.2 from source.
> 
> The debugger is telling me
> 
> Debugger entered--Lisp error: (file-missing "Cannot open load file" "No such file or directory" "modus-themes")
>   require(modus-themes)

That means that Emacs doesn't find an appropriate file (it typically
searches for a file called "modus-themes.elc" then of one "modus-themes.el",
but the real suffixes are given by the value of (get-load-suffixes)..

Most probably you'll have to add the directory where your modus-themes
files are to the variable %load-path.

Cheers
 - t