Linda, I still have the original free Nik software and could let you have a copy. I have only used Nik Silver Effex Pro for most but not all of my B&W conversions. I have used Nik HDR Pro occasionally a long time ago but have used LR for all HDR in recent years. I do not find it as necessary to use HDR as much now given that modern cameras have very much improved dynamic range. The Nik software is now owned by DxO as as you have gathered and it has been upgraded and no longer free. Most comments I have seen on forums suggests that the upgrades are not significant so not worth the money if you still have the originals.