THE OFFICIAL WEB SITE OF PROF DR RETO JORG STRASSER WENT definitely OFF-LINE
To get PDF copies of Prof. Strasser publications, you can visit his page at ResearchGate
https://www.researchgate.net/profile/Reto-Strasser
For getting a trial version of Biolyzer Software, or any of Prof. Strasser's Lab Yellow Books, you can visit the Fluoromatics Lab website
https://www.fluoromatics.com
You are welcome to visit the Biolyzer Software page in Facebook
https://www.facebook.com/groups/biolyzer/