it does not load the complete administration of the module and I can not edit anything, the information is incomplete

Dear camilo007

Could you please let us know your Item Purchase Code of this theme? You can refer guide in here: www.smartaddons.com/documentation/how-to-get-themeforest-item-purchase-code/

We need to check it before supporting.
maybe this issue relate k2 version 2.8.0
refer the solution here www.smartaddons.com/forum/22-sj-k2-slider-module/34722-call-to-undefined-method-k2helperhtmlloadjquery

thanks