Older Macs

Is there ANY work around for using box.com on older Macs? I HAVE to use an older Mac because of the proprietary software and hardware I use for work will not work if I upgrade to the latest greatest OS. Box stopped working on Safari, and eventually Chrome, and now won't work on any Browser. I can't risk my software/hardware not working by updating. It's pretty ridiculous when it worked yesterday but not today.

A lot of people can't afford to shell out thousands for new hardware and software. 

Every post on these forums I read, the reply is "sorry" from box with very little explanation as to why, or an actual fix.

Any tips for a workaround?