This question has been answered by BobRay. See the first response.
Are you using MODX 2.3.1? I think getImages is only compatible with 2.2.x. If so it wouldn't show up for any 2.3 versions.
I don't see it listed here: https://github.com/modxcms/revolution/issues/11630.
If you want to try it (it might work), you could download it directly from here: http://modx.com/extras/package/getimages to your core/packages directory, and in Package Manager, "Search Locally for Packages," then install it.
If you do try it, add a comment at the first link about whether it works or not.
Sorry, I missed the fact that you had written it.Tried that but so far it has not shown up?
The most likely cause is that you filled in the "Supports Up To" field with 2.2 when you submitted it. That means it won't show for users with 2.3.
This should fix it:
* Go here: http://modx.com/extras/package/getimages.
* Select "Update Version" at the upper left.
* Scroll down to the "Supports Up To" field and make it blank.
* Click on the "Update Package" button at the bottom.
Looks like if you set an "up to" you can not then remove it? I set it to 2.3 and it shows up.