You can upgrade your system following the guide on Leo4All forums. Works on machines running AMD, no intel update released yet. The Modbin kernel can be used on both AMD and Intel systems.
If you already run 10.5.3 (update from Leo4All v3 through Kalyway Combo Update) and experience issues with graphics or your System Profiler crashes read this: Updating Leo4All
Update on updating Intel machines will follow!!!