General :: Error Running A .sh Script When Extracted From A Jar File - Nstall.sh: Command Not Found

I am trying to run a script called install.sh as follows: I get a jar file, and extract it using the command: unzip filename.jar -D path/to/files then I navigate to that directory where I extracted the files, and run the command: sh install.sh (where install.sh is one of the files that has been extracted in that directory using the above unzip command.) running this command gives me an error:'nstall.sh: command not found.' among other errors in the script ( from that portion of the script that should not even be executed, which is really weird). However, instead of unzipping the jar file, if I just copied the same install.sh file to that folder, and ran the 'sh install.sh' command, the script runs fine.