hi icco, the 48.0.2 update only contained a single fix for a startup crash caused by a thrid-party product hooking into firefox. since you are able to normally operate firefox 48.0.1 already, there is no need for the .2 update (and i suspect that's also the reason why it isn't offered).

https://www.mozilla.org/en-US/firefox/48.0.2/releasenotes/

thanks but the question is why could i MANUALLY check for updates on 1 pc and got 48.0.2 but not on 2 other pc's ?