You don't need the previous versions. What you need is to download these files:
http://mycroft.su/en/cat/portativnye_pleery/headdirect_corp_hifiman_hm601_8gb/mycroft_tools_v216fa2.zip
http://mycroft.su/en/cat/portativnye_pleery/headdirect_corp_hifiman_hm601_8gb/mycroft_hm_601rockboxputonsdcarddbd22.zip
http://mycroft.su/en/cat/portativnye_pleery/headdirect_corp_hifiman_hm601_8gb/mycroft_hm_601rockbox6e3b0.zip
Note that these files are for HM-601.
The driver installation process depends on which firmware is installed. If the first Rockbox version, than you should manually uninstall the firmware by rebooting the samsung memory chip (it had been explayned in the thread), and then your OS will ask for drivers, you just need to show the path (they are in the tools_v2 archive). If you use the second or newer versions, just follow these instructions (they work for updating rockbox firmware too):
To return to the original firmware:
1) Open the archive tools_v2. Install the driver for your OS.
2) Run the flasher RK27_UpgradeImage with administrator's rights.
3) Turn on the player.
4) Connect the player via usb to the PC.
5) Go to System / System -> Debug (Don't touch!) / Debug (do not touch!) -> View HW info.
6) In the program RK27Upgrade_Image click on the button to the right from the "Image??" button, select the firmware image, then click the "?? (U)" button and wait.