[GNC] porting Gnucash from W10 to Linux Mint

[Sam Fredo]

i'm trying to move away from Microsoft so I've settled on Linux Mint.

I've been using Gnucash for several years now and it is absolutely the best.

I have tried to move the .gnucash file to the Linux Mint version but the 
file won't open. I receive a message that the Mint version is to old and 
the windows file has unsupported features.

Windows version is 5.10

Mint version is 3.8

I tried to download the latest version of Gnucash using the Software 
Manager but it appears that 3.8 is the current version.

I also looked at installing Gnucash from the Flatpack. I'm new to this 
so I'm hesitent to try this.

i've tried Export/Import but that doesn't seem to work.

So my question is, how (what is the best/easiest way) do it move my 
Gnucash data from W10 Gnucash version 5.10 to Mint Gnucash version 3.8?

Thanks

Sam