Here is an installation guide that works perfectly for HulkStream Kodi add-on. As a third party add-on, you are advised not to discuss this add-on on the Kodi official forum.
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How to Install HulkStream on Kodi Krypton 17 / Leia 18:
Select File explorer(Manager)
Choose Add Source
Input web address http://mbebe.github.io/blomqvist and then clickon OK
Save the name of the media source in the box below.
Inputblomqvist then click on OK
Navigate to home screen
Locate and click the icon that looks like a browser
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Choose Install from compressed (zip) file
be patient for add-on notification to come up
Choose Install from Repo
Choose Video add-ons
Click on Install
Wait for the Add-on was installed notification
The add-on was installed notification is an indication that your Kodi add-on is ready for use.