Important Upgrding K 1.7.0 -> K 1.7.2: Invalid argument supplied for foreach() in /home/site/public_html/administrator/modules/mod_menu

Those warnings do not affect Kunena at all. If you have disabled jDownloads plugin, but still get the same error from the same file -- then the plugin is very badly designed. Only removing it helps in that case.

Is the error showing up in every Kunena page? JDownloads and menu issue may be related and to do something on the way we display the menu.

If you're in production site, you should know that displaying errors will give hackers a neat possibility to destroy your site. So please turn PHP display errors feature off. If it's local development site -- who cares.

I don't get the jDownloads error anymore - only the mod_menu ones. I only see them when I install Kunena though - no other time.

Good to know. When and where are you seeing those warnings? I mean to ask if they are in the log file or seen in a page? And which page is that?

after clicking Finish the site spins for like 30 secs, then I get those errors at the top of the page. Happens even on subsequent reinstalls. If you want to take a look just let me know.

Interesting. I'm not sure what's causing this, because of it should be loading Kunena control panel page. I need to check at some point if it's doing also something else.

it does load control page with those errors at the top, but it takes a long time. After that I see no errors and install seems ok.