Okay, I’m pretty sure what’s going on is that
apm, the program that installs packages for Atom, is not putting quotes around the path. You can test this on your own: create a folder such as
C:\R&M, open a command line, and type
cd C:\R&M, then
cd "C:\R&M". You will observe the first command failing and the second command working as expected. In order to fix this, APM will need to be patched. I’ve dropped an issue onto the APM repo and it shouldn’t be a difficult fix.
In the mean time, you have two options. You already know the first, which is to wrestle with the slightly overbearing Windows 10 account system and try to get it to give you a new user folder name. The second is to download git if you don’t already have it (or a GUI client like GitKraken) and clone the repos of any packages you want to install into your
.atom/packages folder. Once you have the code for an Atom package on your hard drive, you can navigate to that folder via the command line and issue the
apm install command, which will set the package up. Then open or reload Atom.