Official links for some old versions:

v6.3d
Pro: http://www.get-right.com/getrt63dpro.exe
Standard: http://www.get-right.com/getrt63d.exe

v6.3c
Pro: http://www.get-right.com/getrt63cpro.exe
Standard: http://www.get-right.com/getrt63c.exe

v6.3b
Pro: http://www.get-right.com/getrt63bpro.exe
Standard: http://www.get-right.com/getrt63b.exe


Alternative Official Links
If the links above don't work, try these:

v6.3d
Pro: http://download.getright.com/getrt63dpro.exe
Standard: http://download.getright.com/getrt63d.exe

v6.3c
Pro: http://download.getright.com/getrt63cpro.exe
Standard: http://download.getright.com/getrt63c.exe

v6.3b
Pro: http://download.getright.com/getrt63bpro.exe
Standard: http://download.getright.com/getrt63b.exe