From Newsgroup: comp.lang.apl

On Sunday, December 20, 2020 at 11:18:38 AM UTC-8, jib...@gmail.com wrote:

Is there a way to use extended memory with APLSE for dos?
Is it still possible to license it for personal use?

You might try using dosbox-x
https://dosbox-x.com

What is DOSBox-X?
DOSBox-X is an open-source DOS emulator for running DOS games and applications. DOS-based Windows such as Windows 3.x and Windows 9x are officially supported. Compared to DOSBox, DOSBox-X is much more flexible and provides more features. Look at the DOSBox-X Wiki for more information about DOSBox-X and usage guides.

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