No such file or directory, popup

[pauline-galea]

> Sent: Wednesday, May 26, 2021 at 2:45 AM
> From: "Philip Kaludercic" <philipk@posteo.net>
> To: pauline-galea@gmx.com
> Cc: "Help Gnu Emacs" <help-gnu-emacs@gnu.org>
> Subject: Re: No such file or directory, popup
>
> pauline-galea@gmx.com writes:
>
> > Emacs 28.0.50 complains with
> >
> > File is missing: Cannot open load file, No such file or directory, popup
>
> Popup is a third-party library[0], that other third-party packages use.
>
> It would seem you (manually?) installed a package that requires a
> dependency (popup) you do not provide. From your other message I guess
> it is auto-complete. Have you considered using company? AFAIK it is
> usually the preferred auto-completion framework nowadays.

I would agree with your evaluation because it is first being called by 
auto-complete.
Was not aware of "company" as "auto-complete" was what I had been introduced to.

Have checked and found that "company" is part of GNU ELPA.  I am trying to 
understand
an important here.  I have installed "Emacs 25" from my package  manager.  
Later I
installed Emacs 27.1 and am trying out the latest development version.

One thing that I am finding confusing is what happens when you install an emacs
package, because it does not look as though, the setup will apply to the latest
development verison, even if I use the same init files.

> [0]: 
> https://github.com/auto-complete/popup-el/tree/866a091b83369873b4d1c5d62a590fbb0a150bd0
>
> --
>       Philip K.
>