Download should be secure
Scaned with web based antyvir
https://www.virustotal.com/gui/url/62f9e43c3cec1fa4a322d9d6c7b69a7175e1d6ea4d49f7464ca684283a86eb55?nocache=1
To preserve your configuration and hotkeys from old tibia-30y-kids folder move following
Just full copy and replace, it's gonna be fine ;) If you'll copy before running client for the first time your chages will be overwritten