v5.0_darkmode arrived with a disclaimer: This version writes in other people's hand. I laughed and opened it. The interface blackened, fonts softened; when I hovered over the thumbnails the images rearranged themselves into a route, a map stitched from seemingly unconnected moments: a bus ticket stub, a rainy corner, a theater marquee. I clicked the marquee. Silence. Then, slowly, a name typed itself across the bottom of my screen in a handwriting I suddenly recognized as my own.
It looks like you’re referring to a file named something like:
If the file name contains words like "cracked," "premium unlocker," or "free cape," delete it immediately. These are always malware.
If you cannot get the Feather-Client-Launcher-All-Versions... file to work, consider these alternatives: