@persefoni.pt
What’s your MacOS version? I am having similar problem with Curic Studio extension. The difference is that I have never used it with older versions of SU – I have purchased the latest version of that plugin & installed it under the latest Sketchup Pro (but older MacOS Sierra 10.12.6, MacBook Pro 2015).
Does anybody have an idea of what exactly might be the reason? Is it system based issue? Bad file paths? The developer does not react on my questions. You can find the crash log which I have uploaded to the thread where I was trying to find what was going wrong: https://forums.sketchup.com/t/curic-studio-crashes-on-macos-10-12-6-sketchup-pro-2019-3-permanent-license/113362/5