MEGARA is a fiber-fed spectrograph on the 10.4m Gran Telescopio CANARIAS, offering integral field and multi-object spectroscopy with spectral resolutions of RFWHM ∼ 6{,}000, 12{,}000, and 20{,}000. Our team is developing MEGASTAR, an empirical stellar spectral library based on observations from MEGARA. The goal of MEGASTAR is to provide stellar spectra and derived parameters essential for constructing stellar population synthesis models, facilitating the accurate interpretation of star clusters and galaxies observed with MEGARA. The stars are being observed with RFWHM ∼ 20{,}000, in two spectral intervals: one centered on Hα (6420 -- 6790 Å) and the other on Ca ii triplet (8370 -- 8885 Å). In this contribution, we summarize the published papers of MEGASTAR, and present the second data release, DR2.0. MEGASTAR DR2.0 includes 2{,}838 spectra from 1{,}408 stars— 994 newly added stars along with the 414 stars from the first release. The spectra were obtained with an average continuum signal-to-noise ratio of approximately 215. We provide an overview of the new release sample, a summary of the observations, the data reduction procedure, and instructions for downloading the complete release or individual spectra from the MEGASTAR database.