Error installing MinimServer 2.2 on Synology DS109

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"Hello!
I've created an account on this forum because I'm facing an issue and I can't seem to solve it.
I have a Synology DS109 running DSM 4.2-3259, which is the latest DSM version for this model.
On the MinimServer website, it says that for DSM version 4.2, I need to download the package for version 6. When I try to install it, I get an error saying that the minimum version for this package is DSM 6.
So, if 2.2 works on DSM 4.2, how do I install it?
If 2.2 doesn't work, what other options do I have to install MinimServer for DSM 4.2?
Thank you!"