Recently when I went to update plugins on a WordPress Multisite install, I noticed Gravity Forms wouldn’t update and gave the following error message:
An error occurred while updating Gravity Forms: Update package not available.
This didn’t come as a surprise because I knew the license was expired. I had a new license number to activate, but it wasn’t immediately obvious where I could do that. The plugin list didn’t include a settings link, and the Multisite settings didn’t have anything Gravity Forms–specific.
What I eventually realized: if I update the license on the “main” subsite, it is used for the plugin update process.
I figured this out when I mimicked the location of a non-Multisite’s settings page by adding
wp-admin/admin.php?page=gf_settings to the root domain when I was managing my Multisite’s settings. Once there, I was able to update the license as usual and get everything working.
Hope this helps if you find yourself in the same situation! I have a Gravity Forms license that allows an unlimited number of sites, so I don’t know exactly how it works with a site-limited license—but I’d imagine each subsite where you activate the plugin will count.