Flash development toolkit FDT used for Altivar drives is compatible with Window 10 from version V4.09 release 03 and later on (win11)
Download flash development toolkit version 4.09 R03 directly from Renesas manufacturer:
https://www.renesas.com/document/swe/evaluation-software-flash-development-toolkit-v409-release-03?language=en&r=1169901
(Free registration is need on renesas).
Note: If the link is moved, use google search phrase below to find FDT v 4.09 release 03 on renesas web site
fdt v.4.09 release 03 site:renesas.com