Hello, I've bought Trados Studio 2015 and just downloaded the installation program. 
I have Trados Studio 2011 installed and want to upgrade it. 
I start SDLTradosStudio2015_SR1_4961.exe but at the end, when installation shows "Installing SDL Trados Studio 2015" it ends with an error "Error writing to file C:\Program Files (x86)\Common Files\...\dsofile.dll". 
Any suggestion how to solve the problem?
Thank you!
Marcel
 
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