Yeah. I've had nothing but trouble with the installers.
The traditional GOG downloader keeps shutting itself off after every 2 to 3 gbs of install, I've been redownloading the Witcher 3 for the last three hrs.
The new Galaxy application just won't figure a way to launch the game / patch it which is unfortunate since I already took the time to preload the game the minute the option became available.
And the web browser option...well, its a web browser option.
Its has been a weird and headache-inducing process that almost makes me regret not going with the steam version, but the idea that I'm supporting CDPR directly and that its all DRM free has been the only thing keeping me mellow right now lol.
I'm sure GOG is looking at ways to improve all of this as they expand their infrastructure with GOG Galaxy.