The installer proposes by default to install Sweet Home 3D 32 bit under Windows 10 64 bit, because it's the only option that works on some old computers which should even not be able to run under Windows 10 from this list. The best you can do is to complain to Microsoft to stop accepting to upgrade to Windows 10, or to Intel to make them update their graphics driver.

1. Different names according to 32bits or 64bits

I made the effort to develop a unified installer and certainly won't go back, just because it's more difficult to communicate on multiple installers.

2. Possibility to set path for already installed java, so that SH3D does not install its own.

It's not a recommended way to do anymore, and if you really want to use your installed JRE, you can use Java Web Start version or JAR Executable version.