Hi drnwag
Did you customize your site? Your changes wont be lost if you customize in the child them and you can update the next theme version in the future.
To update the TechOne theme:
Step 1: Backup your site( Include codes + Database)
Step 2: From the dashboard>>Appearance>>Theme, you need to activate the default template( Ex; Twenty Seventeen theme)
( you can refer this document, it's the same http://test.kutethemes.net/koolshop_doc/#mazanoupdate)
Step 3: Click on TechOne and then click Delete( look down in the right). NOTE: DO NOT delete the TechOne-Child
Step 4: Return the dashboard choose Plugins then deactive the TechOne Toolkit, Slider Revolution, WPBakery Visual Composer and delete them.
Step 5: Return the Appearance menus choose Theme>>Add New>>choose your latest theme version>>Install
Step 6: Return the Plugins menus>>New>>and choose the TechOne Toolkit (Slider Revolution, WPBakery Visual Composer plugins are the same)>>Install>>and activate them.
Please do it and let me know.
Regards,