I apologize for the inconveniences.
Probably the crash was caused by a faulty version of the Microsoft redistributable, as reported
here.
Regarding the download speed, i just done a complete reinstallation of libraries here, and speed seems fine. It required less than 5 minutes.
Our servers are located at EU, so download speed may change depending of your location.
For next times, i suggest to assign a path at Update Manager->File->Preferences->Packages Cache.
That creates a copy of the packages in the specified folder. It can be used to perform a reinstallation without downloading the packages again.
We have not tested it, but i guess it would be possible to download the packages while Max is running.
Just close Update Manager in the installation, launch Max, and then run Update Manager to continue the download.