I was looking forever for software for my EX495 and finally stumbled across a pretty cool website listed below. The first link is just for the Ex495 software I was looking for. Downloaded it and it installed perfectly just in case someone still wants whs v1 on their 495. The second link has tons of older software but haven't investigated too much but it's where the 495 software came from. It's a great repository for vintage software. It excited me anyway but I am old so doesn't take much to excite me anymore.
https://archive.org/details/HPEX490RestoreDVD
https://archive.org/details/vintagesoftware