Yes, in Windows it is working normally. The problem so far is specific to Linux, where other people have also complained about the same situation, as can be seen here. (https://github.com/operasoftware/chrome-webstore-extension/issues) Apparently it seems to be the extension "Download Chrome Extension" after version 2.3.0 and 2.4.0. I ran several tests and apparently it's the extension.
As an indication, I circumvented this with the CRX "Extension source viewer" and I was able to install the Chrome Web Store extensions normally.