It is possible for you to compile pspell on your own. We have collected the steps for Linux below. Unfortunately we're unable to provide support for installing pspell on Windows. macOS steps should be similar.
First of all, you need to install the
libpspell dependency. If you are on a Debian/Ubuntu distro, you can do it with one command:
sudo apt-get install -y libpspell-dev
Next, load the environment: https://docs.bitnami.com/installer/components/bnconsole/
After you have done that, proceed to download the PHP sources (e.g. version 7.0.30), compiling the pspell extension and installing it with the following commands:
tar xzf php-7.0.30.tar.gz
Let us know if it worked!