Nokia :: E75 - Does Not Support Sis Files

I've been trying to upgrade the Ovi maps on my E75, because navigation has kept me saying that I need to renew the license. I went to Nokia web site and found out that I need to upgrade Ovi maps in order to get the free navigation. I have a 202.12.01 firmware and I installed it once again when I had unsuccessfully tried to upgrade Ovi maps. I have Ovi maps v3.01 09wk44b01 (MW OpenGL LM MN) and Map version 0.1.24.114 (OpenBitLM 6.22.5). I've deleted all old maps and started to download new ones successfully over Nokia Ovi Suite. I've downloaded Nokia Ovi Suite and followed the instructions for downloading and installing the newest version of Ovi maps application (I suppose it must be newer than the one I have on now, because navigation still wants me to buy license, I guess it must be 3.03 or higher). I've tried it several times from the scratch, just to make sure I did it right. Of course I've also chosen the right E75 phone from the drop down menu and I downloaded the file nokia_maps_3.01_09wk44_b01_s60_3.2_lm_rom.sis. I double-clicked it and everything seems to be right, but when action on the phone should be required the installation guide says "Nokia E75 does not support sis files". From the sis file name I can only now see that I have this version already installed.Does this mean I can not use navigation for free on E75?