The software does not start, how to solve the problem?

Question

linux

- I downloaded the software in a zip archive
- unzip it in /opt/software-name/
- I go to /opt/software-name/
- I launch the software with ./software-name, after giving the rights to execute
But the output is an error: " bash: . /software-name: No such file or directory ", although the file is in place. What could be the reason for this and how to fix it?

Answer 1

Reinstalled the OS and it worked. It's just a shame that I had to reconfigure the environment.
Probably something got up wrong, because even grep did not work

Answer 2

means you didn't go to /opt/software-name/
what does ls -l show?