Steam needs "evaporating". As "Sober" quite rightly says "get the Dvd" it is no longer expensive.
Before loading the Dvd. Make sure that you leave no trace of Steam on your system.
Use a registry cleaner like "Ccleaner" and restart your system afterwards.
Go to your start button and use search and check again for any left over SH5.
If you find anything delete it and run the registry cleaner again.
If you already have a Uplay account play it safe and set up a new one for your new Silent Hunter 5 installation. This will come up at the end of the installation.
After the install go to the following folders.
In the path Ubisoft\Silent Hunter 5\Data\Support\GameUpdater
There is a "GU"application that will update your game to v1.2
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