Hi Jan
There is no problem to upgrade. But upgrade all my installed extensions (what you use - component, plugin, module)
And if you get problems, you can easy to install previous version (DO NOT UNINSTALL).
But if you'll get errors - tell me about that - may by some bugs (because all my code is revised)
If you uninstall - the whole tables will be dropped.
Only install over the version. If you will need previous versions - just tell its numbers.
There are many changes. In 5.0 you can dynamically load your placemarks - it will be quick map loading.
There is some restrictions for dynamic loading
zhuk.cc/2013/09/16/zh-googlemap-componen...jax-loading-and-etc/
But up to Monday I think I'll do new release with support managing by group list for case dynamic loading map objects. In developing mode it is already works, but I'm doing a lot of refactoring my code - therefore not released yet.