I want to install an extension in Joomla 3.5.1 (CiviCRM 4.6.15, Php 5.6.19, Linux, been using CiviCRM for several years, continuous upgrading).
But, the extension isn't appearing for me ("SPARKPOST / CIVICRM INTEGRATION 1.3.1"). I've refreshed, waited a day and refreshed again, but it doesn't appear. It's been released for more than two months, although the most recent version is from beginning of April.
I don't know what else to try. I would like to avoid manually downloading and installing the extension, because I'm concerned that it wouldn't show future updates if it's not showing the actual released version.
Many extensions are listed under the Add New list of extensions, but some newer ones (as far as I can tell) are not, although they're listed as available on CiviCRM.(https://civicrm.org/extension-civicrm-compatibility/civicrm-46)
Two of the missing items, for example: "SPARKPOST EMAIL EXTENSION FOR CIVICRM 1.0" and "SPARKPOST / CIVICRM INTEGRATION 1.3.1".
Another one (with a more recent release date than the two above "OUTBOUND DOMAIN ENFORCEMENT VERSION 1.4" IS listed on my "New Extensions" tab, so it's not just a date thing.