First of all, sorry for the delay in our response. Were did you put the KREST files? Have in mind that they should be in
C:\Bitnami\suitecrm-7.6.4-0\apps\suitecrm\htdocs\KREST\`, and I suspect that maybe you put them inC:\Bitnami\suitecrm-7.6.4-0\KREST` instead. Also, in case I am wrong, did you set any kind of permissions over this folder? (probably not, but want to make sure)
I’ll be looking forward to receiving your reply so that we can help you sort this out.