Updating your wallet via private key MUST do work, no matter what wallet version you have.
https://www.reddit.com/r/IntenseCoin/comments/89gw15/guide_converting_your_141142_wallet_to_the_145/
Example Key:
0B33DFD38FED54CBA53521ABC40DDE3F75C7E38BFF7A962075C9FFDD4D74A0C08B053DD8B520274 E4EBFB003ACBAC24B1AAD8CDDFFD43375F2751FF50DBCCD396D40F8A2C0A9F9D70EE536EBF12E73 238923935067E4AC317AC577030B73B15327C33FE709E411BE0225DE049B2375DB2CC935CC7355F 439F8264CC14EF88DC5
Temporarily copy this key to a notepad file. We will need this in a moment.
[ Determine your Secret and Public View/Spend Keys ]
That one big 256 character string is actually four separate 64 character keys. We need to separate them out so we know what we're dealing with. Just add a return/line break after each 64 characters so you get your 4 keys. They are in a very specific order.
1. Spend Public
2. View Public
3. Spend Secret
4. View Secret
Using our example key, we would separate that out to...
Spend Public: 0B33DFD38FED54CBA53521ABC40DDE3F75C7E38BFF7A962075C9FFDD4D74A0C0
View Public: 8B053DD8B520274E4EBFB003ACBAC24B1AAD8CDDFFD43375F2751FF50DBCCD39
Spend Secret: 6D40F8A2C0A9F9D70EE536EBF12E73238923935067E4AC317AC577030B73B153
View Secret: 27C33FE709E411BE0225DE049B2375DB2CC935CC7355F439F8264CC14EF88DC5
With this 4 keys you can always recover your wallet and get access!