Register custom block plugin (OJS 2) without upgrading

Hi all,

I’ve just written a block plugin in OJS 2 following these instructions:

(yes, I know these docs are not actively maintained, but I couldn’t find the info anywhere else)

Then I realised the last step is:

php tools/upgrade.php upgrade

For various reasons, I am not in a position to upgrade OJS at the moment. So my question is, can I register my new block plugin without upgrading OJS?? (I can see the plugin in the block plugins list in the interface, but there is no “Enable” button.)

Thanks very much,