OMSI 2 Issues. (1 Viewer)

I had OMSI 2 Downloaded onto my computer via steam and everything was working fine. I was playing one afternoon on Scunthorpe with a Studio Polygon Vehicles. i closed OMSI 2 and went away for a weekend. When i have come back and attempted to reload OMSI on my computer its now telling me that it needs to instal? Is there any particular reason as to why this may have happened. As everything was working fine previously.
 
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