The installation files are in the Releases section.
There are independent versions for Joomla 3 and for Joomla 4. I have numbered the versions of agadvents so that 3.x and smaller is for Joomla 3. The version 4.x is for Joomla 4.
The version for Joomla 4 cannot be used as an update for Joomla 3.
This Joomla! extension is a simple feature. But it is very likely that your requirements are already covered or require very little customisation.
If you have more complex requirements, need new features or just need some support, I am open to paid customisation and support around this Joomla! extension.
Contact me and we'll work it out!