To be honest, I would NOT want to depend on Installatron for updates.
LS has a good update feature, but you have to pay for it (ComfortUpdate). If you use LS regulary, I think it is a good investment. If you are capable to pick the files out of the ZIP file that you think are responsible, you are probably also able to replace all files with the new files (except for the files you adapted like themes, etc.). So you could just do the updates manually.
All these automatic installation tools like Installatron do not care about the different software tools and they generally do not offer current updates. So i would highly recommend to do the updates yourself, either through ComfortUpdate, or manually yourself. It is basically the same process you already did, just with more files. Pretty easy. We all have done it for years, before ComfortUpdate came out.
I answer at the LimeSurvey forum in my spare time, I'm not a LimeSurvey GmbH employee.
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