Hello,
1. This extension doesn't have detail documentation nor demo(backend), only a very limited description.
2. The only place that mentioned 'meta keyword' were under '2-plg_contentvm2tags' --which the whole section using Extra Small text. In the meantime, the description can be understood as that's Optional by enable/disable that plugin.
3. I have experience with VM2Tag before (in a template I bought) and it was using custom fields as tags. It is reasonable that I can't aware that I have to ask if it can use custom fields as tags.
4. When there's a sticky on top topic claiming VM2Tags 1.8 can use VMcustom field OR metakey mode, while the latest version is 1.8.9, not 1.9, not 2.0. It's reasonable that I think there's no major change been made, not to mention take out one major feature of it.
I'm asking for the older version of this extension when the custom fields still is an option, working for Joomla3.7.5 and VM3.2.6.
I think this is reasonable and may not bother you too much?
Of course, if you prefer a refund, I can take it, too.