Hello,

I'm getting 500 Internal Server Error when I'm trying to install...
_____Xoops 2.5.9
_____Windows Server 2012
_____IIS 8.0
_____PHP 5.6.33
_____FastCGI

Please do help me on this

Thanks

To be honest, I never installed XOOPS on IIS, so I couldn't really help you here.
The usual suspects are things like having server permissions properly set, as well as directories.

There are some older articles on installing XOOPS on IIS that maybe will provide you with some help:

1) Microsoft

2) User comment here in FAQ

3) You might also find useful the article on Performance Tuning XOOPS on IIS

4) Finally, there are some links in articles in Taiwan, but you would need the Google Translator for the text

If you get it to work, please report back here what you've done, so others can benefit from it