In recent versions of K2 installer team introduced a feature which blocks installation in case of critical failure leaving you no choice but address the issue and perform repair. It basically blocks all the other options leaving you with Recover as an only available option as shown below:
This option is here for a reason and unless you 100% sure that you need to exit out of this mode you should analyze error and perform repair, if necessary involving vendor support. But in case of throw away test box or initial installation you may want to unblock all the other option, let’s say to perform removal and start from scratch. To do that you just need to delete contents of the Setup State folder (default location is “C:\Program Files\K2\Setup\State”) which in this case will contain json files with the state of failed installation. Those files contain sections like “ComponentActions”, “FailedTarget”, “CompletedTargets”, but to the best of my knowledge support will ask you for installer trace to investigate any type of installer failures.
Like I said in case you understand what you are doing and need to exit out of “Recover” mode you can just use folder clear up approach explained above.