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The website is back online now. Sorry about the inconvenience.
Thanks for reporting this. We are currently looking into the problem.
Until the website is fixed, please use this link to download the package:
http://download.matlink.org.s3-website-us-west-2.amazonaws.com/MATLink.zip
The code can be found here https://github.com/rsmenon/MATLink . @Szabolcs Horvát Can probably tell you more about it, he is (co?)developer of it.
Obvious, did so, many thanks :-)