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Gamayun, Iorgov and Lisovyy in 2012 proposed that tau function of the Painlevé equation equals to the series of с=1 Virasoro conformal blocks.
We study similar series of c=-2 conformal blocks and relate it to Painlevé theory.
The arguments are based on Nakajima-Yoshioka blow-up relations on Nekrasov partition functions.
We also study series of q-deformed c=-2 conformal blocks and relate it to q-Painlevé equation.
Using this we prove formula for the tau function of q-Painleve A_7^{(1)'} equation (based on arXiv:1811.04050v1)