Pfew, thanks for the reply
I thought the coins might vaporize or something, what the fuck do I know
My advice would be to
1) update your "LINX" wallet
2) either download bitcoin core, electrum or buy a cheap hardware wallet
3) move your funds from "LINX" to core, electrum or your hardware wallet
Eventough, you bitcoins can never "evaporate", it's still possible that this (to me unknown) wallet uses some kind of encryption or derivation scheme to encrypt or derive private keys, and when you don't update, you might not be able to manage our unspent outputs anymore.
An other possibility is that it's a centrally managed SPV wallet, if the central servers go down, you might have problems spending your funds.
These are only 2 theory's, i don't know "LINX", so i have no idear how they work, but if they tell you you have to update your wallet, i would take it very serious (seriously: consider moving to a trusted wallet)..