Question Kunena install fail v 4.0.7 on joomla 3.4.5

Doing fresh install on a subdomain, and have installation failure. Tried to clear cache as per other forum post but this did nothing for me. Messages below.

Kunena Installation Failed!

Sorry, installation failed with following error:

Notice: Use of undefined constant KPATH_ADMIN - assumed 'KPATH_ADMIN' in /home/therunel/runelounge.com/administrator/components/com_kunena/install/schema.php on line 13

Notice: Use of undefined constant KPATH_ADMIN - assumed 'KPATH_ADMIN' in /home/therunel/runelounge.com/administrator/components/com_kunena/install/schema.php on line 14

Warning: DOMDocument::load(): I/O warning : failed to load external entity "/home/therunel/runelounge.com/administrator/KPATH_ADMIN/install/install.xml" in /home/therunel/runelounge.com/administrator/components/com_kunena/install/schema.php on line 281

Notice: Trying to get property of non-object in /home/therunel/runelounge.com/administrator/components/com_kunena/install/schema.php on line 401

Warning: Invalid argument supplied for foreach() in /home/therunel/runelounge.com/administrator/components/com_kunena/install/schema.php on line 422

Fatal error: Class 'KunenaRoute' not found in /home/therunel/runelounge.com/administrator/components/com_kunena/install/sql/install/php/sampledata.php on line 147

I have found that the file install.php in KPATH_ADMIN is empty

Strange, I just opened the dashboard, the installer started to auto-run again and it worked.

we are investigating the issue.

Any update on this issue? I have a similar issue trying to update on Windows. The following is all I get from the page:

Kunena 4.0.7 Installer
Kunena Installation Failed!

Preparing installation...

Installation Details

Preparing installation...

Joomla keeps telling me to finish the Kunena installation and all it does is fail...

try to clean admin kunena cache, this seems to be the issue.

I'm afraid I don't know how to do that since the Kunena component screen won't come up due to the failed installation... Would you please provide instructions to do this without using the component control panel page?

ok.

login on the backend - system - clear cache - set filter to "admin" - select kunena - click on delete

That did not fix my issue. Still no access to the Kunena component control panel and still a "Please complete Kunena installation!" message on the menu on the left side of the screen. Follow the link and the same Failed Kunena installation message...

I also tried doing a fresh installation of Kunena from the downloaded zip file with the same issue still coming up...

try this build