SQLite schema issue

Hi

I have an old family tree, i have not maintained since 2019
Today I needed to open it, and got the errormessage that the tree was 
built on sqlite schema version 20 and this version only supports 18-18
I think the error message was wrong because I believe the old tree was 
version 18 and the installed gramps supports only version 20.
Been looking for backups of the tree - but no luck.

To fix this I think i need to install and old version of gramps open the 
tree, and export it as xml.
However it is not easy to find how i can install an old version, so any 
hint would be appreciated.

I run gramps 5.1.5 on linux mint 20.3

/Kaj




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