Try using Autostakkert 3 for stacking ( much better than Registax 6 ) and only use Registax 6 to do final processing ( sharpening , colour etc.. )
Registax 6 is very old and I don’t think it has been updated in a long while
Ive used Autostakkert 3 for stacking and Registax 6 for final processing since late 2018 and it works well on Windows 10 ( 64bit system )
Cheers
Martin
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