Hi Alain,
in most keyboards you have to press a combination of buttons during the power up to see the software version, but I don't know how to do this in the VA5.
To do the update you have to download the files, save them to a floppy disk and follow the instructions which are usually included (among the files you download there is something called readme.doc or readme.txt with all the instructions); anyway, I don't think that your VA5 really needs a software update, especially if that is just the version 1.01. I have updated my VA7 to version 2.0 but I had to take it to a laboratory because they had to replace an internal chip too.
Regards
Andrea
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.