I've downloaded the game three times and I keep getting the same error: sh: 0: Can't open ./gog_soma_2.6.0.7.sh

I've already added the permission and I've tried installing it with both ./gog_soma_2.6.0.7.sh and sh gog_soma_2.6.0.7.sh

MD5 = 19e36cfa166932ac58fde94b983bcdb9