Here is a compiled libfaketime.

Put the .so in your homedir and then try e.g.
$ LD_PRELOAD=/home/user/libfaketimeMT.so.1 \
FAKETIME="-60 d" navicore

Advancing more than 7 days before end of trial voids your license. But if you get in the 7 day period again your license is valid again.

Yes, changing the date is definetely a more elegant solution.

I verified it on Diablo with 2.2.6.377-1. It does work, but you'll need to save your original evaluation key. The first one you used, bound to the MAC address of your tablet.

Problem is, I lost that one. My WiFi AP doesn't like it when I pick any other MAC address than that one. Besides, its effort to keep the non-real MAC address.

I guess I'll get a debit card and buy the stupid thing. Then use that license with this trick. Let this be a warning: backup everything before you flash!