When I try to open https://bitbucket.org/ligos/readablepassphrasegenerator/downloads/ReadablePassphrase%201.1.1.plgx%20signatures.txt with Kleopatra (or GpgEX), I get the error:
An error occurred: Kleopatra: Could not open file "H:/Downloads/ReadablePassphrase%201.1.0.plgx%20signatures" for reading: Input/output error (218136625)
But it looks like it wiped the extension off and tried to open it without the .txt.
It also looks like Kleopatra can't generate armored or Base64 signatures... when did you stop supporting this format?