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100% right
The Siremis v5.1.0 was never officially released, it was referred to it while using the Git master branch after the release of v4.4.0 and before the release of v5.3.0.
If you installed from Git master branch during this interval, just install v5.3.0 over the v5.1.0, setting proper config attributes for accessing the database, either by editing siremis/Config.xml or running again the web installation wizard (see https://kb.asipto.com/siremis:install53x:main#post_installation).