nik collection not working in photoshop 2021

Any advice or help will be so appreciated. Don't need to do too much editing anymore. 1) Did I need the 2020 version on this computer? 2) All other versions I own? We've been upgrading to almost all versions during the more than 20 years of using PSE and PS but what we really need now is to preserve our organizer since we've tagged thousands and thousands of family and other memories over decades and decades. It stalls during the conversion process because it won't 'see'the external drive it had previously identified.

The install was successful, the media loaded from that drive but now trying to convert the backup so the tags and other associated info for each image can be used in 2021. Downloaded PSE2021 which we owned since March, 2021 and attached a PSE dedicated external drive to it.

So we're using our older MacAir with macOS 10.15.7 instead of downgrading our new computer with Monterey OS. We bought 20 within months but when Monterey came, things fell apart on our new computer. Only option for us is to use a laptop with macOs 10.14-10.15 or macOS11.

Recently found out that Adobe will no longer support all versions of Photoshop Elements.

Nik collection not working in photoshop 2021