Hi:
See if this works...
Download and save, but do not run the 2nd file from the link below. That is the 64 bit printer driver file.
http://www.catalog.update.microsoft.com/Search.aspx?q=HP%20PSC%20950
Download and install this free file utility. The 2nd file at the top of the page is for 64 bit.
http://www.7-zip.org/
After you install 7-Zip, right click on the printer driver file you downloaded, and select 7-Zip from the list of items on the menu.
Have 7-Zip Extract to: and let it extract the driver file into its folder name.
Then use the add printer wizard in the windows control panel.
When you get to the part where you are asked to install a driver for your printer, click on Have Disk and browse to the printer driver file 7-Zip created\prnhp001, and select the HP PSC 950 printer from the list, and see if the driver installs that way.
If you are unfamiliar with how to manually add a printer in W10, see this link...
http://www.laptopmag.com/articles/add-printer-windows-10