Try dis?

Author: kieranhj

_layouts/prods_post.html

@@ -121,7 +121,7 @@
                     {% if page.jsbeebmodel %}
                     <a target='_blank' href="https://bbc.godbolt.org/?disc=https://bitshifters.github.io/content/{{ page.download }}&autoboot&model={{ page.jsbeebmodel }}" class="btn btn-md btn-success">
                     {% else %}
-                    {% if page.Platform  == "Acorn Archimedes" %}					
+                    {% if page.platform == "Acorn Archimedes" %}					
 					<a target='_blank' href="https://archi.medes.live/#disc=https://bitshifters.github.io/content/{{ page.download }}&{{ page.emuboot }}" class="btn btn-md btn-success">					
 					{% else %}
                     <a target='_blank' href="https://bbc.godbolt.org/?disc=https://bitshifters.github.io/content/{{ page.download }}&autoboot&model=Master" class="btn btn-md btn-success">