I think my hard drive is on its way out cos all sorts of things are crashing for no apparent reason.
I recently downloaded all the 5 monkey island games and saved the intallers for future use.
The problem i have is as follows.

I have the witcher 3 and grim fandango in my games list , i want to download the installers to use at a later date but cant work out how to do it.

Also , for some reason these 2 games are not showing on the left hand panel where all my monkey island games are listed.

Sounds like you're trying to use GOG Galaxy. Just use the website - it's much easier.

Hover over your name at the top of the page. Click Games. Click the game you want to download, then look under "Download Offline Backup Game Installers".

thanks ryan thats exactlly what i wanted i have put it on a pen just in case

If you are using Galaxy...

1. Click on "Library" on the top bar.
2. Click on the game thumbnail.
3. on the game page that opens click on "more" and then on "Backups and goodies".
4. This will lead to the page from where you can download the Offline Installers and also bonus contents.

Hope it helps.

The games on the left are only the ones installed. To see your library, click library. ;P

Remeber to back up saves if any/

You can, of course, just redownload them.

Or clone your hard drive.