Looking for target 5.4 fitting software

i have target 5.4 and today i went to open it and i got an error. so i went to find the zip program and i see it has vanished. i had to do a restore a bit ago and more than likely that program did not copy over to the new updated win 10 program.so where might i find the target 5.4 fitting program again. i do not see it anywhere now in a search online. the last time i got it was online and from phonak. but i do not see it there anymore either. i looked here for the diy ara and that faild to show as well, i got opps that site has moved. thanks.