Thanks for your reply pdc.
Scan Gear is properly installed and the launcher was automatically generated when I installed the program.
The point is, it keeps saying there is no available scanner connected to my computer, which is wrong.
Here is a screenshot (in French):
"Impossible to find any available scanner"
"Cable might be unplugged or your scanner might be switched off."
"Check it out and try again."
Then Scangear immediately shuts down once I click "OK": I have no access to any menu/option/setting whatsoever.
I thought it'd be better to use this thread, as this matter has previously been discussed with others.
So, I'd be grateful for any clue: should I downgrade to scangearmp 1.80? should I erase some hidden file in my system to make it work?