I did this just now and then updated packages. This is what happened.
(@v1.4) pkg> add LoopVectorization@0.8
Updating registry at `C:\Users\Ashok Kumar Mishra\.julia\registries\General`
Updating git-repo `https://github.com/JuliaRegistries/General.git`
Resolving package versions...
Installed RecursiveFactorization ─ v0.1.4
Installed VectorizationBase ────── v0.12.29
Installed SIMDPirates ──────────── v0.8.21
Installed SLEEFPirates ─────────── v0.5.5
Installed NNlib ────────────────── v0.7.3
Installed Arpack ───────────────── v0.3.2
Installed FinEtools ────────────── v4.0.5
Installed Zygote ───────────────── v0.5.3
Installed LoopVectorization ────── v0.8.20
Updating `C:\Users\Ashok Kumar Mishra\.julia\environments\v1.4\Project.toml`
[91bb5406] ↓ FinEtools v4.3.0 ⇒ v4.0.5
[bdcacae8] ↑ LoopVectorization v0.6.30 ⇒ v0.8.20
[872c559c] ↑ NNlib v0.7.1 ⇒ v0.7.3
Updating `C:\Users\Ashok Kumar Mishra\.julia\environments\v1.4\Manifest.toml`
[7d9fca2a] ↓ Arpack v0.4.0 ⇒ v0.3.2
[68821587] - Arpack_jll v3.5.0+3
[91bb5406] ↓ FinEtools v4.3.0 ⇒ v4.0.5
[bdcacae8] ↑ LoopVectorization v0.6.30 ⇒ v0.8.20
[872c559c] ↑ NNlib v0.7.1 ⇒ v0.7.3
[f2c3362d] ↑ RecursiveFactorization v0.1.0 ⇒ v0.1.4
[21efa798] ↑ SIMDPirates v0.7.17 ⇒ v0.8.21
[476501e8] ↑ SLEEFPirates v0.4.7 ⇒ v0.5.5
[3a884ed6] ↑ UnPack v0.1.0 ⇒ v1.0.1
[3d5dd08c] ↑ VectorizationBase v0.10.5 ⇒ v0.12.29
[e88e6eb3] ↑ Zygote v0.5.2 ⇒ v0.5.3
Building SLEEFPirates → `C:\Users\Ashok Kumar Mishra\.julia\packages\SLEEFPirates\jGsib\deps\build.log`
Building Arpack ──────→ `C:\Users\Ashok Kumar Mishra\.julia\packages\Arpack\zCmTA\deps\build.log`
(@v1.4) pkg> update
Updating registry at `C:\Users\Ashok Kumar Mishra\.julia\registries\General`
Updating git-repo `https://github.com/JuliaRegistries/General.git`
Updating `C:\Users\Ashok Kumar Mishra\.julia\environments\v1.4\Project.toml`
[91bb5406] ↑ FinEtools v4.0.5 ⇒ v4.3.0
[bdcacae8] ↓ LoopVectorization v0.8.20 ⇒ v0.6.30
[872c559c] ↓ NNlib v0.7.3 ⇒ v0.7.1
Updating `C:\Users\Ashok Kumar Mishra\.julia\environments\v1.4\Manifest.toml`
[7d9fca2a] ↑ Arpack v0.3.2 ⇒ v0.4.0
[68821587] + Arpack_jll v3.5.0+3
[91bb5406] ↑ FinEtools v4.0.5 ⇒ v4.3.0
[bdcacae8] ↓ LoopVectorization v0.8.20 ⇒ v0.6.30
[872c559c] ↓ NNlib v0.7.3 ⇒ v0.7.1
[f2c3362d] ↓ RecursiveFactorization v0.1.4 ⇒ v0.1.0
[21efa798] ↓ SIMDPirates v0.8.21 ⇒ v0.7.17
[476501e8] ↓ SLEEFPirates v0.5.5 ⇒ v0.4.7
[3a884ed6] ↓ UnPack v1.0.1 ⇒ v0.1.0
[3d5dd08c] ↓ VectorizationBase v0.12.29 ⇒ v0.10.5
[e88e6eb3] ↓ Zygote v0.5.3 ⇒ v0.5.2
Maybe I should open another thread for this, its unrelated to the topic @Elrod ?