In certain non-limiting, aspects, the present invention relates to storage stable premixes of a polyol suitable for polyurethane or polyisocyanurate foam preparation having, at least, 1,1,1,4,4,4-hexafluoro-2-butene as the blowing agent and optional one or more additional additives andor auxiliary blowing agents in amounts suitable for polyurethane or polyisocyanurate foam preparation. A corner portion 95 having a curved surface is formed between the fluid inlet passage 7A and a front header 4. The gas is pumped from outside the container, through an inlet cylinder, a fan wheel, a scrubbing space, over a surface of the liquid, through a cyclone space, and out a top outlet. Responsive to a detected change, an update application program backup is created including files associated with the application program and entries of the common applications registry pertaining to the application program.