In the "About" Tab you can see which Version exactly you are running. Would need to look it up, as i believe there have been very early versions which would need to have you update Manually, But Most versions should have a Button somewhere to check for Updates and should automatically be able to figure out the latest most recent version and Install that.
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However, even if you could do that, i personally would still recommend to just download the most Recent Stable Software Version from debian.krontech.ca (which in this Case at the current time is 0.7.2), and get some New Micro-SD-Card to flash the New Software onto. Keep the Other one with the old Software around In case something goes wrong or doesnt work with the New Version (or as a known working Point to Fall back onto at least, if for example the other SD Card breaks or something unexpected, very rare, but SD Cards can fail sometimes), or goes Wrong while you would try to update. You might even discover something about the new version some time later down the line, which you dont like or not used to for some reason, so in my opinion it would make a lot of sense to have the Option to go back, as its really not much more work, and Micro SD-Cards are really fairly cheap. Thats at least how i do it, and can recommend anyone to also do that, especially with such a extreme Gap between the Versions.
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Whatever you end up doing, make sure to Properly backup Factory Calibration Data and Settings, as i think you would at least very much need them, if you had to re-install the Version you are currently running, in case you had to go back to that for some Reason. On newer versions i think you wouldnt need them, but i would still want to keep them, as a bunch of older versions absolutely need them, in case you ever want to run one of those ever again. Also take note of the Exact version of Software you are Running, and make sure, that is still available to download (for example, there has been a version of Software, which would allow the 1.4 to run 200kfps or something like that, and none after that did allow you to do that. I can see, why you would want to keep that around somewhere, because all versions after cant do that out of the Box. Someone from Krontech somewhat recently posted some Steps you need to do, to Modify existing current Software Releases to also be able to do that, but i personally dont know if i would be able to follow them to get that to work. This Version is not available anymore, so in that case, if i was you, i would for sure want to keep that old SD Card and just not Touch the Software on there, and just Flash a New one with the Current Version. Then you could go back whenever you want, or need the 200Kfps for example, and just run the New Software with probably much Improved Color and a bunch of other added Features all the other time.).