How can i manually install and use gnu arm toolchain

So this post is related to https://community.renesas.com/tools/e2studio/f/e2studio-forum/32789/e2studio-add-update-tool-chain-after-fsp-update/116308#116308
My code was largely made with the previous FSP, and now i really wish to try it on the ra8m1, im on linux, i untared the gnu arm toolchain but renesas e2studio doesnt seem to recognize it
how can i add the toolchain manually?

Welp as always its solved an hour after posting spent 4 hours looking
en-support.renesas.com/.../16979421