Here are some downloads for various roots up to 10 million digits. These were calculated by myself.

Square roots

2	root2-2-10000000.txt
3	root2-3-10000000.txt
5	root2-5-10000000.txt
6	root2-6-10000000.txt
7	root2-7-10000000.txt
8	root2-8-10000000.txt
10	root2-10-10000000.txt

Roots 3

2	root3-2-10000000.txt
3	root3-3-10000000.txt
4	root3-4-10000000.txt
5	root3-5-10000000.txt
6	root3-6-10000000.txt
7	root3-7-10000000.txt
9	root3-9-10000000.txt
10	root3-10-10000000.txt