I've just downloaded the latest K2 from the website, but I'm unable to install it on the latest Joomla (3.3.6).

When I click "Upload & Install" using "K2_v2.6.9.zip" on the extension manager, I'm being stopped by the following message:

SQL Error (1146): Table 'Certwell.suqva_k2_categories' doesn't exist SQL=SHOW FULL COLUMNS `suqva_k2_categories`

I've made sure permission are set fine. I can install any other extension and/or template without any problems at all. The website is running on a dedicated server with root access should it be needed for some debugging.

Screenshot of error:

Hello,
There are probably files from a previous install/ update left in Joomla!'s tmp folder. Make sure to delete them and try again.
Let me know if the issue persists.

It was a new / freshly installed Joomla. Only every failed attempt of trying to install K2 was inside the tmp folder.

I've managed to fix the issue myself by manually running K2_v2.6.9/administrator/components/com_k2/install.mysql.sql (after changing the table names appropiately). It installed perfectly fine afterwards. Seems like for some unknown reason the installer doesn't run the SQL file before trying to query the database. Obviously causing errors.

Nice to hear that the issue is resolved.
Make sure to empty the /tmp folder afterwards.