I recently wanted to upgrade from perl 5.32 to perl 5.36 via my cygwin terminal using apt-cyg with no success. In particular I tried:
apt-cyg install perl=5.36.1-1
The error message was:
Package perl=5.36.1-1 not found or ambiguous name, exiting
I ended up running setup-x86_64.exe from Windows explorer in order to install what I wanted.
I am using the version of apt-cyg which I got from github using the following command:
git clone https://github.com/kou1okada/apt-cyg.git