Zsh does not read the prior Bash dotfiles to establish your PATH or other environment variables. You need to create that Zsh dotfile if you haven't. Otherwise, you may be attempting to run a 32-bit application in a strictly 64-bit operating system.
In the Terminal, key in this HEREDOC that will write out the bare essentials of a ~/.zshrc file. Do not type the heredoc> prompts, and press return after the last line's EOF entry:
<<'EOF' > ~/.zshrc
heredoc> export PATH="$HOME:/usr/local/bin:${PATH}"
heredoc> PS1="%m: %~ %% "
heredoc> EOF
To set the PATH and prompt in the current Terminal window:
source ~/.zshrc
The ~/.zshrc dotfile will be read each time you launch a Terminal session.