OS Windows7 The wallet worked as normal. Connection through AdvOR. Version Zecwallet.FullNode.0.9.2.
Rebooted and reinstalled the wallet. Did not help
What is the problem do not understand?
I do not want to download 25 GB again
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Hi @vasilkozlovrf welcome to the forums! 
I’m not sure what the issue is but I will CC this question to @adityapk00 (the ZecWallet developer)
For troubleshooting check the help documents: Troubleshooting Issues - ZecWallet Docs
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You are most likely running into a zcashd issue here: zcashd assertion failure CopyPreviousWitnesses() Assertion (nd->witnessHeight == -1) || (nd->witnessHeight == indexHeight - 1) · Issue #4301 · zcash/zcash · GitHub
Please look at this bug and a way to fix it:
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Deleted the wallet.dat file. The wallet has started and updated. though all old transactions and addresses are gone, but I don’t need them …
You’ll need to import your private keys at some point