As the subject of this topic might enlighten some of you out there on the internet, my download just won't finish.
It doesn't get "converted" to the gog-installer, it remains the temp-like file eventhough i completed my download completely.
"444.9mb of 444.9 completed" gives me the idea every bit & byte has been transfered to my little hard disk.

Anyone know what might be the problem?
I downloaded the file several times and it gives me the same "fault" so i can't install & play the darn game I loved back in the day.

If you downloaded the file with the downloader you could try to download it with your browser.

The downloader sometimes 'forgets' to rename the installer once the file is downloaded, so if you did downlodaded the file with the downloader and you have a file with a name like

evolva_setup.gog_download

or something like that, you could also try to rename it to,

evolva_setup.exe